APA (7th ed.) Citation

Ragan, J. F., & Thomas, L. B.. (1993). Principles of economics (2nd ed.). The Dryden Press.

Chicago Style (17th ed.) Citation

Ragan, James F., and Lloyd Brewster Thomas. Principles of Economics. 2nd ed. Fort Worth, Tex.: The Dryden Press, 1993.

MLA (9th ed.) Citation

Ragan, James F., and Lloyd Brewster Thomas. Principles of Economics. 2nd ed. The Dryden Press, 1993.