diff --git a/about.md b/about.md
index 4dc91cd..0e7a007 100644
--- a/about.md
+++ b/about.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/about_author.md b/about_author.md
index a9c1042..9566835 100644
--- a/about_author.md
+++ b/about_author.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/appendix-a.md b/appendix-a.md
index ede685e..8c5b734 100644
--- a/appendix-a.md
+++ b/appendix-a.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/book-index.md b/book-index.md
index e629d35..8bee926 100644
--- a/book-index.md
+++ b/book-index.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-01.md b/chapter-01.md
index a3afd0f..fc56d44 100644
--- a/chapter-01.md
+++ b/chapter-01.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-02.md b/chapter-02.md
index 43ee283..5143edb 100644
--- a/chapter-02.md
+++ b/chapter-02.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-03.md b/chapter-03.md
index ddc5cc3..2afe5ce 100644
--- a/chapter-03.md
+++ b/chapter-03.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-04.md b/chapter-04.md
index d58c018..0ea8b65 100644
--- a/chapter-04.md
+++ b/chapter-04.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-05.md b/chapter-05.md
index ba8750a..0ceb103 100644
--- a/chapter-05.md
+++ b/chapter-05.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-06.md b/chapter-06.md
index 1431b91..47c6772 100644
--- a/chapter-06.md
+++ b/chapter-06.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-07.md b/chapter-07.md
index 524fc99..5d73234 100644
--- a/chapter-07.md
+++ b/chapter-07.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-08.md b/chapter-08.md
index 53c86c2..98c3464 100644
--- a/chapter-08.md
+++ b/chapter-08.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-09.md b/chapter-09.md
index 996710e..40631f0 100644
--- a/chapter-09.md
+++ b/chapter-09.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-10.md b/chapter-10.md
index 7cf0459..971eaf0 100644
--- a/chapter-10.md
+++ b/chapter-10.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-11.md b/chapter-11.md
index fb2bf1a..0bb064f 100644
--- a/chapter-11.md
+++ b/chapter-11.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-12.md b/chapter-12.md
index 106183e..0ccfbfb 100644
--- a/chapter-12.md
+++ b/chapter-12.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-13.md b/chapter-13.md
index 8ebd41f..cf27058 100644
--- a/chapter-13.md
+++ b/chapter-13.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-14.md b/chapter-14.md
index b50a886..5bf314e 100644
--- a/chapter-14.md
+++ b/chapter-14.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-15.md b/chapter-15.md
index dfb8dd5..6a64e1f 100644
--- a/chapter-15.md
+++ b/chapter-15.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-16.md b/chapter-16.md
index 83850b1..002c87d 100644
--- a/chapter-16.md
+++ b/chapter-16.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-17.md b/chapter-17.md
index cf58968..facb0d8 100644
--- a/chapter-17.md
+++ b/chapter-17.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-18.md b/chapter-18.md
index 2051032..50844a8 100644
--- a/chapter-18.md
+++ b/chapter-18.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-19.md b/chapter-19.md
index 66b4bff..7186fb5 100644
--- a/chapter-19.md
+++ b/chapter-19.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-20.md b/chapter-20.md
index b46c970..bbd75a8 100644
--- a/chapter-20.md
+++ b/chapter-20.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-21.md b/chapter-21.md
index 0060afd..e6db869 100644
--- a/chapter-21.md
+++ b/chapter-21.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-22.md b/chapter-22.md
index c5a8dc8..a9f1515 100644
--- a/chapter-22.md
+++ b/chapter-22.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-23.md b/chapter-23.md
index 988862a..0263e9b 100644
--- a/chapter-23.md
+++ b/chapter-23.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-24.md b/chapter-24.md
index e4d672f..96614ed 100644
--- a/chapter-24.md
+++ b/chapter-24.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-25.md b/chapter-25.md
index 59b94af..9c16fcc 100644
--- a/chapter-25.md
+++ b/chapter-25.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-26.md b/chapter-26.md
index 52ad2f9..3797fd1 100644
--- a/chapter-26.md
+++ b/chapter-26.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-27.md b/chapter-27.md
index caa1b04..a93de13 100644
--- a/chapter-27.md
+++ b/chapter-27.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-28.md b/chapter-28.md
index 2163a6c..9801f5f 100644
--- a/chapter-28.md
+++ b/chapter-28.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-29.md b/chapter-29.md
index ca78bda..918f058 100644
--- a/chapter-29.md
+++ b/chapter-29.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-30.md b/chapter-30.md
index 2bdd8e4..9d2b345 100644
--- a/chapter-30.md
+++ b/chapter-30.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-31.md b/chapter-31.md
index c348283..3406187 100644
--- a/chapter-31.md
+++ b/chapter-31.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-32.md b/chapter-32.md
index aaf3301..bba9b2f 100644
--- a/chapter-32.md
+++ b/chapter-32.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-33.md b/chapter-33.md
index 629337c..9af64a5 100644
--- a/chapter-33.md
+++ b/chapter-33.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-34.md b/chapter-34.md
index 7554d15..6f99e27 100644
--- a/chapter-34.md
+++ b/chapter-34.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-35.md b/chapter-35.md
index 702b144..ed3609d 100644
--- a/chapter-35.md
+++ b/chapter-35.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-36.md b/chapter-36.md
index 08825f4..ca8e43c 100644
--- a/chapter-36.md
+++ b/chapter-36.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-37.md b/chapter-37.md
index b4f7686..3585b08 100644
--- a/chapter-37.md
+++ b/chapter-37.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-38.md b/chapter-38.md
index 066c6d1..087228c 100644
--- a/chapter-38.md
+++ b/chapter-38.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-39.md b/chapter-39.md
index 74186c3..60ff6ee 100644
--- a/chapter-39.md
+++ b/chapter-39.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-40.md b/chapter-40.md
index 7bd885d..7ef846d 100644
--- a/chapter-40.md
+++ b/chapter-40.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-41.md b/chapter-41.md
index 84441cb..793e07b 100644
--- a/chapter-41.md
+++ b/chapter-41.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-42.md b/chapter-42.md
index bc65211..533db48 100644
--- a/chapter-42.md
+++ b/chapter-42.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-43.md b/chapter-43.md
index 11e7c69..4a866e4 100644
--- a/chapter-43.md
+++ b/chapter-43.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-44.md b/chapter-44.md
index cdde8ec..f8f11a4 100644
--- a/chapter-44.md
+++ b/chapter-44.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-45.md b/chapter-45.md
index b8c5afe..d69e3a4 100644
--- a/chapter-45.md
+++ b/chapter-45.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-46.md b/chapter-46.md
index ba8348f..ff2bc9e 100644
--- a/chapter-46.md
+++ b/chapter-46.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-47.md b/chapter-47.md
index cf46394..46ed167 100644
--- a/chapter-47.md
+++ b/chapter-47.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-48.md b/chapter-48.md
index 79c4623..04ac5a8 100644
--- a/chapter-48.md
+++ b/chapter-48.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-49.md b/chapter-49.md
index e959c99..fdfa45f 100644
--- a/chapter-49.md
+++ b/chapter-49.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-50.md b/chapter-50.md
index 2cdcdb7..dbffbce 100644
--- a/chapter-50.md
+++ b/chapter-50.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-51.md b/chapter-51.md
index 8cab9a2..6b05af4 100644
--- a/chapter-51.md
+++ b/chapter-51.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-52.md b/chapter-52.md
index f1c7e7a..3f697e5 100644
--- a/chapter-52.md
+++ b/chapter-52.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-53.md b/chapter-53.md
index f6ee5fd..10d5582 100644
--- a/chapter-53.md
+++ b/chapter-53.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-54.md b/chapter-54.md
index 9c186f3..01b93f6 100644
--- a/chapter-54.md
+++ b/chapter-54.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-55.md b/chapter-55.md
index fe7ceae..b226edd 100644
--- a/chapter-55.md
+++ b/chapter-55.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-56.md b/chapter-56.md
index 5162565..025ae14 100644
--- a/chapter-56.md
+++ b/chapter-56.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-57.md b/chapter-57.md
index b2af785..074f387 100644
--- a/chapter-57.md
+++ b/chapter-57.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-58.md b/chapter-58.md
index 991c10b..3b478f6 100644
--- a/chapter-58.md
+++ b/chapter-58.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-59.md b/chapter-59.md
index 283b6ee..ff13c30 100644
--- a/chapter-59.md
+++ b/chapter-59.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-60.md b/chapter-60.md
index 5ae2368..bf80f0d 100644
--- a/chapter-60.md
+++ b/chapter-60.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-61.md b/chapter-61.md
index d9ff92b..ea7bf39 100644
--- a/chapter-61.md
+++ b/chapter-61.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-62.md b/chapter-62.md
index e7cdc3f..b1994e0 100644
--- a/chapter-62.md
+++ b/chapter-62.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-63.md b/chapter-63.md
index 6119f4e..ae7418a 100644
--- a/chapter-63.md
+++ b/chapter-63.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-64.md b/chapter-64.md
index fc7afc5..3f23016 100644
--- a/chapter-64.md
+++ b/chapter-64.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-65.md b/chapter-65.md
index 5a392a6..a24c526 100644
--- a/chapter-65.md
+++ b/chapter-65.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-66.md b/chapter-66.md
index 42de8cc..a162f52 100644
--- a/chapter-66.md
+++ b/chapter-66.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-67.md b/chapter-67.md
index d62d271..6440bec 100644
--- a/chapter-67.md
+++ b/chapter-67.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-68.md b/chapter-68.md
index d807451..c18d90f 100644
--- a/chapter-68.md
+++ b/chapter-68.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-69.md b/chapter-69.md
index d58f994..d30f4b6 100644
--- a/chapter-69.md
+++ b/chapter-69.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/chapter-70.md b/chapter-70.md
index b20faf7..e3618c3 100644
--- a/chapter-70.md
+++ b/chapter-70.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'
diff --git a/intro.md b/intro.md
index fdddb41..3a2decb 100644
--- a/intro.md
+++ b/intro.md
@@ -2,7 +2,9 @@
 title: Michael Abrash's Graphics Programming Black Book, Special Edition
 author: Michael Abrash
 date: '1997-07-01'
-isbn: '1576101746'
+identifier:
+- scheme: ISBN
+  text: 1576101746
 publisher: The Coriolis Group
 category: 'Web and Software Development: Game Development,Web and Software Development:
   Graphics and Multimedia Development'