Citazione Stile APA (7a Edizione)

Verderber, R. F., Sellnow, D. D., & Verderber, K. S. (2015). The Challenge of effective speaking: In a digital age (16e.). Cengage Learning.

Citazione stile Chigago Style (17a edizione)

Verderber, Rudolph F., Deanna D. Sellnow, e Kathleen S. Verderber. The Challenge of Effective Speaking: In a Digital Age. 16e. Stamford, CT: Cengage Learning, 2015.

Citatione MLA (9a ed.)

Verderber, Rudolph F., et al. The Challenge of Effective Speaking: In a Digital Age. 16e. Cengage Learning, 2015.