Beal, George M.
Iowa State University Press , 1962
Buku Teks
Misumi, Jyuji, author
University of Michigan Press, 1985.
Buku Teks
edited by Dorwin Cartwright, Alvin Zander
Harper & Row , 1968
Buku Teks
Johnson, David W., 1940-, author
Allyn and Bacon, 1997
Buku Teks
Johnson, David W., 1940-, author
Allyn and Bacon, 2000
Buku Teks