APA (7th ed.) Citation

Prewitt, K., Verba, S., & Salisburg, R. H. (1991). An introduction to American government (6. ed.). HarperCollins.

Chicago Style (17th ed.) Citation

Prewitt, Kenneth, Sidney Verba, and Robert H. Salisburg. An Introduction to American Government. 6. ed. New York, NY: HarperCollins, 1991.

MLA (9th ed.) Citation

Prewitt, Kenneth, et al. An Introduction to American Government. 6. ed. HarperCollins, 1991.