APA aipamena

Verderber, R. F. (1994). The challenge of effective speaking (9th ed.). Wadsworth Pub. Co.

Chicago Style aipamena

Verderber, Rudolph F. The Challenge of Effective Speaking. 9th ed. Belmont, Calif: Wadsworth Pub. Co, 1994.

MLA aipamena

Verderber, Rudolph F. The Challenge of Effective Speaking. 9th ed. Wadsworth Pub. Co, 1994.