diff --git a/README.md b/README.md
index bf00eee..36a5219 100644
--- a/README.md
+++ b/README.md
@@ -21,3 +21,8 @@ Notes:
 * Allocates a 1 page buffer to store the code
 * Relative or absolute paths can be used
 * Can be invoked as lower case (e.g. `chtype ...`)
+
+Resources:
+* [File Types Table](http://www.easy68k.com/paulrsm/6502/PDOS8TRM.HTM#B-1T) - [ProDOS 8 Technical Reference Manual](http://www.easy68k.com/paulrsm/6502/PDOS8TRM.HTM) - 
+* [File Types](https://www.kreativekorp.com/miscpages/a2info/filetypes.shtml) - [Jon Relay's Apple II Info Archives](https://www.kreativekorp.com/miscpages/a2info/)
+* [ProDOS File Types 2.0](https://macgui.com/kb/article/116) - [Mac GUI](https://macgui.com)