Andry Indrady, examiner
F.A. Davis , 2004
Buku Teks
Jon R. Conte, editor
Sage Publications, 2002
Buku Teks
Schwartz, Lita Linzer
Haworth Press, 2006
Buku Teks
edited by Philip John Davies and Fredric A. Waldstein
Manchester University Press, 1987
Buku Teks
Anderson, Charles W., 1934-
Prentice-Hall, 1967
Buku Teks