Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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