SEVERIN, W. J. (1988). Communication Theories. Longman.
Lua i Stíl Chicago (17ú heag.)SEVERIN, Werner J. Communication Theories. Longman, 1988.
Lua MLA (8ú heag.)SEVERIN, Werner J. Communication Theories. Longman, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.