Choi, Jae Chun
Ingangwa dongmul
Kungree, 2007
 Buku Teks
Linden, Eugene, author
The parrot's lament: and other true tales of animal intrigue, intelligence and ingenvity
A Dutton Book, 1999
 Buku Teks
Benyus, Janine M. author
The Secret language of animals : a guide to remarkable behavior
Black Dog & Leventhal Publishers, 2014
 Buku Referensi
Tatang Mitra Setia, author
Hirarki dominansi orangutan jantan dewasa serta tanggapan orangutan jantan dan betina dewasa terhadap seruan panjang dari jantan dewasa lain di Pusat Penelitian Ketambe, Taman Nasional Gunung Leuser
1995
 UI - Tesis Membership
Scott, John Paul, author
Animal behavior
University of Chicago Press, 1958
 Buku Teks
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