Mulloy, William
Social Science Research Institute, University of Hawaii, 1978
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
Johnstone, Paul
Routledge, 1988
Buku Teks
Chard, Chester S.
McGraw-Hill, 1975
Buku Teks