Pfeiffer, John E.
Harper & Row, 1969
Buku Teks
edited by Eric Delson, Ian Tattersall, John A. Van Couvering and Alison S. Brokks
Garland Publishing, 2000
Buku Referensi
Rouse, Irving
McGraw-Hill, 1972
Buku Teks SO
Bellwood, Peter
HarperCollins, 1978
Buku Teks SO
Childe, V. Gordon
Penguin Books, 1958
Buku Teks SO