Moore, Wilbert E. (Wilbert Ellis), author
Prentice-Hall, 1967
Buku Teks
Cooper, Robert L., author
Cambridge University Press, 1989
Buku Teks
Srinivas, M.N., author
University of California Press, 1973
Buku Teks
Lauer, Robert H., author
Allyn and Bacon, 1982
Buku Teks
edited by George W. Albel, Justin M. Joffe and Linda A. Dusenbury
Sage, 1988
Buku Teks