Forsyth, Donelson R.
Wadsworth and Cengage Learning, 2014
Buku Teks
Bonner, Hubert
The Ronald Press, 1959
Buku Teks
edited by Muzafer Sherif and M.O. Wilson
Harper & Brothers, 1953
Buku Teks
edited by Michael A. Hogg and R. Scott Tindale
Blackwell, 2003
Buku Teks
edited by Dorwin Cartwright, Alvin Zander
Harper & Row , 1968
Buku Teks