Παραπομπή APA
Krugman, P. R., & Obstfeld, M. (1991). International economics: Theory and policy (2nd ed.). New York: HarperCollins.
Παραπομπή Chicago StyleKrugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. New York: HarperCollins, 1991.
Παραπομπή MLAKrugman, Paul R., and Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. New York: HarperCollins, 1991.
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