Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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