Severin, W. J., & Tankard, J. W. (1997). Communication theories: Origin, methods, and users in the mass media (4th ed.). Longman.
Lua i Stíl Chicago (17ú heag.)Severin, Werner J., agus James W. Tankard. Communication Theories: Origin, Methods, and Users in the Mass Media. 4th ed. New York: Longman, 1997.
Lua MLA (9ú heag.)Severin, Werner J., agus James W. Tankard. Communication Theories: Origin, Methods, and Users in the Mass Media. 4th ed. Longman, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.