APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Ruffin, Roy J., and Paul R. Greogory. Principles of Economics. Glenview, Illinois: Scott, Foresman & Co, 1983.

MLA (9th ed.) Citation

Ruffin, Roy J., and Paul R. Greogory. Principles of Economics. Scott, Foresman & Co, 1983.