Chesler, Mark A.
Macmillan, 1981
Buku Teks
Foster, Lois E. Elaine
Prentice-Hall, 1981
Buku Teks
editor, Lewis A. Coser, Bernard Rosenberg
MacMillan Press , 1969
Buku Teks
Wright, Charles Robert, author
Ramaja Karya, 1986
Buku Teks
Hurn, Christopher J.
Allyn and Bacon, 1993
Buku Teks