APA-referens (7:e uppl.)

Verderber, R. F. (1982). The challenge of effective speaking (5th ed.). Wadsworth.

Chicago-referens (17:e uppl.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 5th ed. Califonia: Wadsworth, 1982.

MLA-referens (9:e uppl.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 5th ed. Wadsworth, 1982.