Clark, R. A. (1984). Persuasive messages. Harper & Row.
Cita Chicago (17th ed.)Clark, Ruth Anne. Persuasive Messages. New York: Harper & Row, 1984.
Cita MLA (9th ed.)Clark, Ruth Anne. Persuasive Messages. Harper & Row, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.