Teaching Sign Language to Chimpanzees, Very Good Trade Paperback

Teaching Sign Language to Chimpanzees by Beatrix T. Gardner - Softcover

Teach Your Dog British Sign Language by Anne Cakebread Paperback

Innovative Practices for Teaching Sign Language Interpreters Used

Teaching Sign Language to Chimpanzees by Gardner, R. Allen; Gardner, Beatrix T.

Nim : A Chimpanzee Who Learned Sign Language by Herbert S. Terrace (1987 HC)

Teaching Sign Language to Chimpanzees by Gardner, R. Allen; Gardner, Beatrix T.

Nim: A Chimpanzee Who Learned Sign Language by Terrace, Herbert S.