APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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