APA (7th ed.) Zitazioa
Verderber, R. F. (1991). Essentials of Persuasive speaking: Theory and context. Wadsworth.
Chicago Style (17th ed.) Zitazioa
Verderber, Rudolph F. Essentials of Persuasive Speaking: Theory and Context. Califonia: Wadsworth, 1991.
MLA (9th ed.) Zitazioa
Verderber, Rudolph F. Essentials of Persuasive Speaking: Theory and Context. Wadsworth, 1991.
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