Cita APA (7a ed.)

Krugman, P. R., & Obstfeld, M. (1991). International economics: Theory and policy (2nd ed.). HarperCollins.

Cita Chicago Style (17a ed.)

Krugman, Paul R., y Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. New York: HarperCollins, 1991.

Cita MLA (9a ed.)

Krugman, Paul R., y Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. HarperCollins, 1991.