APA (7th ed.) Citation

Verderber, R. F. (1984). The challenge of effective speaking (6η εκδ.). Wadsworth Pub. Co..

Chicago Style (17th ed.) Citation

Verderber, Rudolph F. The Challenge of Effective Speaking. 6η εκδ. Belmont, Calif.: Wadsworth Pub. Co., 1984.

MLA (9th ed.) Citation

Verderber, Rudolph F. The Challenge of Effective Speaking. 6η εκδ. Wadsworth Pub. Co., 1984.