Huntington, Samuel P.
The Belknap Press, 1981
Buku Teks
Stephen J. Wayne [et all.]
Thomson, 2005
Buku Teks
Davis, David Howard
Nelson-Hall Publishers, 1999
Buku Teks
edited by Edward Conrad Smith and Arnold John Zurcher
Barnes & Noble, 1966
Buku Teks
Irish, Marian D.
Prentice-Hall, 1962
Buku Teks