APA aipamena

Verderber, R. F. (1982). The challenge of effective speaking. Wadsworth Pub.

Chicago Style aipamena

Verderber, Rudolph F. The Challenge of Effective Speaking. Belmont, CA: Wadsworth Pub, 1982.

MLA aipamena

Verderber, Rudolph F. The Challenge of Effective Speaking. Wadsworth Pub, 1982.