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, Ill.: Scott, Foresman, 1986.

MLA (9th 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.