APA Citatie

Verderber, R., Sellnow, D. D., & Verderber, K. S. (2012). Speak. Wadsworth Cengage learning.

Chicago Style citaat

Verderber, Rudolph, Deanna D. Sellnow, en Kathleen S. Verderber. Speak. Boston: Wadsworth Cengage learning, 2012.

MLA citatie

Verderber, Rudolph, et al. Speak. Wadsworth Cengage learning, 2012.