APA (7th ed.) Citation

Prewitt, K., Verba, S., & Salisbury, R. H. (1991). An introduction to American government (6. ed., 1. print.). HarperCollins.

Chicago Style (17th ed.) Citation

Prewitt, Kenneth, Sidney Verba, and Robert H. Salisbury. An Introduction to American Government. 6. ed., 1. print. New York, NY: HarperCollins, 1991.

MLA (9th ed.) Citation

Prewitt, Kenneth, et al. An Introduction to American Government. 6. ed., 1. print. HarperCollins, 1991.