APA (7th ed.) Citation

Ruffin, R. J., & Gregory, P. R. (1983). Principles of economics. Scott Foresman.

Chicago Style (17th ed.) Citation

Ruffin, Roy J., and Paul R. Gregory. Principles of Economics. Scott Foresman, 1983.

MLA (8th ed.) Citation

Ruffin, Roy J., and Paul R. Gregory. Principles of Economics. Scott Foresman, 1983.

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