APA (7th ed.) Citation

Ruffin, R. J. (1993). Principles of economics (5. ed.). HarperCollins.

Chicago Style (17th ed.) Citation

Ruffin, Roy J. Principles of Economics. 5. ed. [New York, NY]: HarperCollins, 1993.

MLA (9th ed.) Citation

Ruffin, Roy J. Principles of Economics. 5. ed. HarperCollins, 1993.

Warning: These citations may not always be 100% accurate.