APA (7th ed.) Citation

Ruffin, R., & Gregory, P. R. (1990). Principles of microeconomics (4th ed.). Scott, Foresman.

Chicago Style (17th ed.) Citation

Ruffin, Roy, and Paul R. Gregory. Principles of Microeconomics. 4th ed. Scott, Foresman, 1990.

MLA (9th ed.) Citation

Ruffin, Roy, and Paul R. Gregory. Principles of Microeconomics. 4th ed. Scott, Foresman, 1990.

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