Cita APA (7th ed.)

Case, K. E., Fair, R. C., & Oster, S. M. (2013). Principles of economics (10th Horizon edition.). Pearson Education Ltd.

Cita Chicago (17th ed.)

Case, Karl E., Ray C. Fair, i Sharon M. Oster. Principles of Economics. 10th Horizon edition. Boston: Pearson Education Ltd, 2013.

Cita MLA (9th ed.)

Case, Karl E., et al. Principles of Economics. 10th Horizon edition. Pearson Education Ltd, 2013.