Phillips, Gerald M.
Macmillan, 1982
Buku Teks
Sayles, Leonard R.
Harper & Row, 1971
Buku Teks
edited by Linda L. Putnam, Michael E. Pacanowsky
Sage, 1983
Buku Teks
Chun, Wei Choo
Oxford university press, 1998
Buku Teks
Hovland, Carl I.
Yale University Press, 1964
Buku Teks