APA (7th ed.) Citation

Krugman, P. R., Wells, R., & Graddy, K. (2008). Economics (European ed., 1. printing.). Worth.

Chicago Style (17th ed.) Citation

Krugman, Paul R., Robin Wells, and Kathryn Graddy. Economics. European ed., 1. printing. New York, NY: Worth, 2008.

MLA (9th ed.) Citation

Krugman, Paul R., et al. Economics. European ed., 1. printing. Worth, 2008.