Cita APA (7th ed.)

Verderber, R. F. (1988). The challenge of effective speaking (Seventh edition.). Wadsworth Publishing Company.

Cita Chicago (17th ed.)

Verderber, Rudolph F. The Challenge of Effective Speaking. Seventh edition. Belmont, California: Wadsworth Publishing Company, 1988.

Cita MLA (9th ed.)

Verderber, Rudolph F. The Challenge of Effective Speaking. Seventh edition. Wadsworth Publishing Company, 1988.