The following page(s) were read and participated in some format to the information contained in the Language Studies section.  Direct quotes or references are cited on their respective pages.

Language in Apes: How much do they know and how much should we teach them? (link has expired, no further source notation)

Animal Cognition and Learning: Dr. Robert Cook.

Animal Communication: The Ape Language Controversy.

Central Washington University: Chimpanzees and Human Communication Institute.