Cita APA (7th ed.)

Main, R. S. (1981). Elements of microeconomics (2nd ed.). West Pub. Co..

Cita Chicago (17th ed.)

Main, Robert S. Elements of Microeconomics. 2nd ed. St. Paul: West Pub. Co., 1981.

Cita MLA (9th ed.)

Main, Robert S. Elements of Microeconomics. 2nd ed. West Pub. Co., 1981.