APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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