APA (7e ed.) Bronvermelding

Verderber, R. F. (1988). The challenge of effective speaking (Seventh edition.). Wadsworth Publishing Company.

Chicago (17e ed.) Bronvermelding

Verderber, Rudolph F. The Challenge of Effective Speaking. Seventh edition. Belmont, California: Wadsworth Publishing Company, 1988.

MLA (9e ed.) Bronvermelding

Verderber, Rudolph F. The Challenge of Effective Speaking. Seventh edition. Wadsworth Publishing Company, 1988.