Coon, Carleton S., author
Macmillan, 1948
Buku Teks
Laqueur, Walter
N.Y Penguin, 1982
Buku Teks
White, James L., author
Washington Square Press, 1966
Buku Teks
Whetten, David A., author
Prentice-Hall, 2000
Buku Teks
edited by Norman F. Cantor and Samuel Berner
Thomas Y. Crowell, 1970
Buku Teks