Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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