APA (7th ed.) Citation

Case, K. E., Fair, R. C., & Oster, S. M. (2009). Principles of economics (9th ed.). Prentice Hall.

Chicago Style (17th ed.) Citation

Case, Karl E., Ray C. Fair, and Sharon M. Oster. Principles of Economics. 9th ed. Upper Saddle River, NJ: Prentice Hall, 2009.

MLA (9th ed.) Citation

Case, Karl E., et al. Principles of Economics. 9th ed. Prentice Hall, 2009.