APA (7th ed.) Citation

Krugman, P. R., Obstfeld, M., & Melitz, M. J. (2013). International Economics: Theory and Policy. Pearson.

Chicago Style (17th ed.) Citation

Krugman, Paul R., Maurice Obstfeld, and Marc J. Melitz. International Economics: Theory and Policy. Pearson, 2013.

MLA (8th ed.) Citation

Krugman, Paul R., et al. International Economics: Theory and Policy. Pearson, 2013.