McNeill, Paul M.
Cambridge University Press, 1993
Buku Teks
Silverman, William A., author
Oxford University Press, 1985
Buku Teks
Ehrlich, Paul R., author
Islan Press, 2004
Buku Teks
editor, Amy Gutmann, Dennis Thompson
Thomson wadsworth, 2006
Buku Teks
The Johns Hopkins Press, 1954
Buku Teks