APA (7th ed.) Citation

Ruffin, R. J., & Gregory, P. R. (1986). Principles of macroeconomics. Scott, Foresman.

Chicago Style (17th ed.) Citation

Ruffin, Roy J., and Paul R. Gregory. Principles of Macroeconomics. Glenview, IL: Scott, Foresman, 1986.

MLA (9th ed.) Citation

Ruffin, Roy J., and Paul R. Gregory. Principles of Macroeconomics. Scott, Foresman, 1986.