Cita APA (7th ed.)

Krugman, P. R., & Obstfeld, M. (2009). International economics: Theory and policy (8th ed.). Pearson Addison-Wesley.

Cita Chicago (17th ed.)

Krugman, Paul R., i Maurice Obstfeld. International Economics: Theory and Policy. 8th ed. Boston: Pearson Addison-Wesley, 2009.

Cita MLA (9th ed.)

Krugman, Paul R., i Maurice Obstfeld. International Economics: Theory and Policy. 8th ed. Pearson Addison-Wesley, 2009.