Rathus, Spencer A., author
Wadsworth, Cengage Learning, 2013
Buku Teks
Carmichael, Leonard, author
Random House, 1957
Buku Teks
D.C Heath and Company, 1973
Buku Teks
Smith, Edward E., 1940-, author
[Publisher not identified], 2003
Buku Teks
Nietzel, Michael T., author
Prentice-Hall, 1998
Buku Teks