Cita APA (7th ed.)
Verderber, R. F. (1988). The challenge of effective speaking (7th ed.). Wadsworth Pub. Co..
Cita Chicago (17th ed.)
Verderber, Rudolph F. The Challenge of Effective Speaking. 7th ed. Belmont, Calif.: Wadsworth Pub. Co., 1988.
Cita MLA (9th ed.)
Verderber, Rudolph F. The Challenge of Effective Speaking. 7th ed. Wadsworth Pub. Co., 1988.
Atenció: Aquestes cites poden no estar 100% correctes.