Severin, W. J., & Tankard, J. W. (1997). Communication theories: Origin, methods, and users in the mass media (4th ed.). Longman.

Severin, Werner J., and James W. Tankard. Communication Theories: Origin, Methods, and Users in the Mass Media. 4th ed. New York: Longman, 1997.

Severin, Werner J., and James W. Tankard. Communication Theories: Origin, Methods, and Users in the Mass Media. 4th ed. Longman, 1997.