APA-referens (7:e uppl.)

Verderber, R. F. (1985). The challenge of effective speaking (6th ed.). Wadsworth Pub. Co..

Chicago-referens (17:e uppl.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 6th ed. Belmont, Calif.: Wadsworth Pub. Co., 1985.

MLA-referens (9:e uppl.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 6th ed. Wadsworth Pub. Co., 1985.