Mithaug, Dennis E., author
Sage Publications, Inc., 2000
Buku Teks
Kohout, Frank J., author
John Wiley & Sons, 1974
Buku Teks
Blackwell Publishers, Inc, 1999
Buku Teks
Kosso, Peter, author
Cambridge University Press, 1992
Buku Teks
edited by Richard Boyd, Philip Gasper, and J. D. Trout
Bradford Book, 1997
Buku Teks