APA (7th ed.) Citation

Krugman, P., Wells, R., & Graddy, K. (2008). Economics. Palgrave Macmillan.

Chicago Style (17th ed.) Citation

Krugman, Paul, Robin Wells, and Kathryn Graddy. Economics. New York: Palgrave Macmillan, 2008.

MLA (8th ed.) Citation

Krugman, Paul, et al. Economics. Palgrave Macmillan, 2008.