Holloway, Stephen, author
Free Press, 1989
Buku Teks
Canda, Edward R., author
Free Press, 1999
Buku Teks
Johnson, Louise C., 1923-, author
Allyn and Bacon, 1991
Buku Teks
Reichert, Elisabeth, author
Columbia University Press, 2003
Buku Teks
Rhodhes, Margaret L., author
Routledge and Kegan Paul, 1986
Buku Teks