Applesoft Internals:
* http://www.apple2.org.za/gswv/gsezine/GS.WorldView/@A2.GS.TECH.INFO/AppleSoft/

Apple Technical Information Library, March 1997
* http://archaic-apples.shauny.de/files/apple2/til/A2TIL000.TXT
  (includes Applesoft Internals among other things)