Helpman, E., & Krugman, P. R. (1993). Market structure and foreign trade: Increasing returns, imperfect competition, and the international economy. Cambridge, Massachusetts: The MIT Press.
Chicago Style CitationHelpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. Cambridge, Massachusetts: The MIT Press, 1993.
MLA CitationHelpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. Cambridge, Massachusetts: The MIT Press, 1993.
Warning: These citations may not always be 100% accurate.