Langdridge, Darren, author
Pearson, 2004
Buku Teks
Zechmeister, Eugene B., author
McGraw-Hill, 1992
Buku Teks
Barker, Chris, author
John Wiley & Sons, 2002
Buku Teks
Ott, Lyman, author
Duxbury Press, 1993
Buku Teks
Elliot Aronson...[et al.]
McGraw-Hill , 1990
Buku Teks