Cita APA (7a ed.)

Verderber, R. F. (1994). The challenge of effective speaking (9th ed.). Wadsworth Publishing Co.

Cita Chicago Style (17a ed.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 9th ed. Belmont, California: Wadsworth Publishing Co, 1994.

Cita MLA (9a ed.)

Verderber, Rudolph F. The Challenge of Effective Speaking. 9th ed. Wadsworth Publishing Co, 1994.