APA (7th ed.) Citation

Ruffin, R., & Gregory, P. R. (1986). Principles of economics (2nd ed.). Scott, Foresman.

Chicago Style (17th ed.) Citation

Ruffin, Roy, and Paul R. Gregory. Principles of Economics. 2nd ed. Glenview: Scott, Foresman, 1986.

MLA (8th ed.) Citation

Ruffin, Roy, and Paul R. Gregory. Principles of Economics. 2nd ed. Scott, Foresman, 1986.

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