Παραπομπή APA
Helpman, E., & Krugman, P. R. (1985). Market structure and foreign trade: Increasing returns, imperfect competition, and the international economy. Cambridge, Mass.: MIT Press.
Παραπομπή Chicago StyleHelpman, Elhanan., and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. Cambridge, Mass.: MIT Press, 1985.
Παραπομπή MLAHelpman, Elhanan., and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. Cambridge, Mass.: MIT Press, 1985.
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