.Krugman, P. R., & Obstfeld, M. (2006). International economics: Theory and policy (7th ed.). Addison-Wesley.
Citação do estilo Chicago (17ª ed.).Krugman, Paul R., e Maurice Obstfeld. International Economics: Theory and Policy. 7th ed. Boston, MA: Addison-Wesley, 2006.
Citação MLA (9ª ed.).Krugman, Paul R., e Maurice Obstfeld. International Economics: Theory and Policy. 7th ed. Addison-Wesley, 2006.