Tohutoro APA (7th ed.)

Verderber, R. F. (1979). The challenge of effective speaking (4th ed.). Wadsworth Pub. Co..

Tohutoru Kātū Chicago (17th ed.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 4th ed. Belmont, Calif.: Wadsworth Pub. Co., 1979.

Tohutoro MLA (9th ed.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 4th ed. Wadsworth Pub. Co., 1979.