APA (7th ed.) Citation

Ruffin, R. j., & Gregory, P. R. (1983). Principles of macroeconomics. Scott, Foresman.

Chicago Style (17th ed.) Citation

Ruffin, Roy j., and Paul R. Gregory. Principles of Macroeconomics. Glenview, Illinois: Scott, Foresman, 1983.

MLA (9th ed.) Citation

Ruffin, Roy j., and Paul R. Gregory. Principles of Macroeconomics. Scott, Foresman, 1983.