APA (7th ed.) Citation

Amacher, R. C., & Ulbrich, H. H. (1992). Principles of economics (5th ed.). South-Western.

Chicago Style (17th ed.) Citation

Amacher, Ryan C., and Holley H. Ulbrich. Principles of Economics. 5th ed. Cincinnati, Ohio: South-Western, 1992.

MLA (9th ed.) Citation

Amacher, Ryan C., and Holley H. Ulbrich. Principles of Economics. 5th ed. South-Western, 1992.