APA (7th ed.) Citation

Krugman, P. R., & Obstfeld, M. (1994). International economics: Theory and policy (3rd ed.). Harper Collins.

Chicago Style (17th ed.) Citation

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 3rd ed. New York (N.Y.): Harper Collins, 1994.

MLA (9th ed.) Citation

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 3rd ed. Harper Collins, 1994.