Forsyth, Donelson R., author
Wadsworth and Cengage Learning, 2014
Buku Teks
Bonner, Hubert
The Ronald Press, 1959
Buku Teks
edited by Dorwin Cartwright, Alvin Zander
Harper & Row , 1968
Buku Teks
Luft, Joseph, author
National Press Books, 1970
Buku Teks
Luft, Joseph, author
Mayfield Publishing Company, 1984
Buku Teks