Brace, C. Loring, author
Prentice-Hall, 1979
Buku Teks
Howells, William D., author
Doubleday, 1967
Buku Teks
edited by Eric Delson, Ian Tattersall, John A. Van Couvering and Alison S. Brokks
Garland Publishing, 2000
Buku Referensi
Ulijaszek, Stanley J., author
Cambridge University Press, 2012
Buku Teks
Coon, Carleton S., author
Alfred A. Knopf, 1962
Buku Teks