APA (7th ed.) Citation

Krugman, P. R., & Obstfeld, M. (1995). International economics: Theory and policy (4. ed.). Harper Collins.

Chicago Style (17th ed.) Citation

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 4. ed. New York, NY: Harper Collins, 1995.

MLA (9th ed.) Citation

Krugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 4. ed. Harper Collins, 1995.