McKee, Jeffrey K., author
Pearson/Prentice Hall, 2005
Buku Teks
edited by Sally C. Reynolds, Andrew Gallaghe
Cambridge University Press, 2012
Buku Teks
Howells, William D., author
Doubleday, 1967
Buku Teks
Brace, C. Loring, author
Prentice-Hall, 1979
Buku Teks
edited by Eric Delson, Ian Tattersall, John A. Van Couvering and Alison S. Brokks
Garland Publishing, 2000
Buku Referensi