Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

Krugman, Paul R., i Maurice Obstfeld. International Economics: Theory and Policy. Eighth edition. Pearson Addison-Wesley, 2009.