Lewis, Sherman
Duxbury Press, 1980
Buku Teks
Horowitz, Irving Louis
Duke University Press , 2984
Buku Teks
edited by Raymond E. Wolfinger
Prentice-Hall, 1966
Buku Teks
Parenti, Michael
Thomson, 2008
Buku Teks
Parenti, Michael
St Martin's press, 1998
Buku Teks