APA (7th ed.) Citation
Ragan, J. F., & Thomas, L. B. (1990). Principles of economics (ed.). Harcourt Brace Jovanovich.
Chicago Style (17th ed.) Citation
Ragan, James F., and Lloyd B. Thomas. Principles of Economics. ed. San Diego: Harcourt Brace Jovanovich, 1990.
MLA (9th ed.) Citation
Ragan, James F., and Lloyd B. Thomas. Principles of Economics. ed. Harcourt Brace Jovanovich, 1990.
Warning: These citations may not always be 100% accurate.