Gutman, Herbert G.
Pantheon Books, 1976
Buku Teks
Harcourt Brace Jovanovich, 1972
Buku Teks
Battle, Michael, author
Blackwell Publishing, 2006
Buku Teks SO
Fisher, Maisha T., author
Routledge, 2009
Buku Teks
Christian, Barbara.
Greenwood Press, 1980.
Buku Teks