(1980). Persuasive communication / Erwin P. Bettinghaus.
Cita Chicago (17th ed.)Persuasive Communication / Erwin P. Bettinghaus. 1980.
Cita MLA (9th ed.)Persuasive Communication / Erwin P. Bettinghaus. 1980.
Atenció: Aquestes cites poden no estar 100% correctes.