APA (7th ed.) Citation

Krugman, P. R., Melitz, M. J., & Obstfeld, M. (2012). International economics: Theory & policy (9th ed., [student value ed.].). Addison-Wesley.

Chicago Style (17th ed.) Citation

Krugman, Paul R., Marc J. Melitz, and Maurice Obstfeld. International Economics: Theory & Policy. 9th ed., [student value ed.]. Boston [etc.]: Addison-Wesley, 2012.

MLA (9th ed.) Citation

Krugman, Paul R., et al. International Economics: Theory & Policy. 9th ed., [student value ed.]. Addison-Wesley, 2012.