APA (7th ed.) Citation

RUFFIN, R. J., & GREGORY, P. R. (1988). Principles of microeconomics.-- Ed.3. Scott.

Chicago Style (17th ed.) Citation

RUFFIN, Roy J., and Paul R. GREGORY. Principles of Microeconomics.-- Ed.3. Boston: Scott, 1988.

MLA (9th ed.) Citation

RUFFIN, Roy J., and Paul R. GREGORY. Principles of Microeconomics.-- Ed.3. Scott, 1988.