Institute for Contemporary studies, 1979
Buku Teks
Hallahan, Daniel P., author
Prentice-Hall, 1988
Buku Teks
Hallahan, Daniel P., author
Allyn and Bacon, 1994
Buku Teks
Flacks, Richard
Columbia University Press, 1988
Buku Teks
Regan, William
Harper & Row, Publishers, 1970
Buku Teks