Dyfyniad APA

Verderber, R. F. (1982). The challenge of effective speaking (5th ed.). Wadsworth.

Dyfyniad Arddull Chicago

Verderber, Rudolph F. The Challenge of Effective Speaking. 5th ed. Califonia: Wadsworth, 1982.

Dyfyniad MLA

Verderber, Rudolph F. The Challenge of Effective Speaking. 5th ed. Wadsworth, 1982.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.