APA (7th ed.) Zitazioa
Verderber, R. F. (1991). The challenge of effective speaking (8th ed.). Wadsworth Pub. Co..
Chicago Style (17th ed.) Zitazioa
Verderber, Rudolph F. The Challenge of Effective Speaking. 8th ed. Belmont, Calif.: Wadsworth Pub. Co., 1991.
MLA (9th ed.) Zitazioa
Verderber, Rudolph F. The Challenge of Effective Speaking. 8th ed. Wadsworth Pub. Co., 1991.
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