diff --git a/ADB-Scan-codes.md b/ADB-Scan-codes.md
index f5f2026..ac99751 100644
--- a/ADB-Scan-codes.md
+++ b/ADB-Scan-codes.md
@@ -8,7 +8,9 @@
 
 * Inside Macintosh: Text
 * Inside Macintosh: Toolbox Essentials (ch2, pg 43 - Event Manager, figs 2-8, 2-9, 2-10)
+* Guide to the Macintosh Family Hardware (ch8, pg 307)
 * https://developer.apple.com/library/archive/documentation/mac/pdf/MacintoshToolboxEssentials.pdf
+* https://archive.org/stream/apple-guide-macintosh-family-hardware/Apple_Guide_to_the_Macintosh_Family_Hardware_2e#page/n345/mode/2up
 * https://boredzo.org/blog/wp-content/uploads/2007/05/imtx-virtual-keycodes.png
 * https://boredzo.org/blog/archives/2007-05-22/virtual-key-codes
 * Carbon/HIToolbox/Events.h
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