O-Keefe, D. J. Persuasion theory and research. Sage Publications.
Lua i Stíl Chicago (17ú heag.)O-Keefe, Daniel J. Persuasion Theory and Research. Sage Publications.
Lua MLA (8ú heag.)O-Keefe, Daniel J. Persuasion Theory and Research. Sage Publications.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.