Helpman, E., & Krugman, P. R. (1985). Market structure and foreign trade : increasing returns, imperfect competition and the international economy / Elhanan Helpman and Paul R. Krugman: Increasing returns, imperfect competition and the international economy. Wheatsheaf.
Chicago Style (17th ed.) CitationHelpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade : Increasing Returns, Imperfect Competition and the International Economy / Elhanan Helpman and Paul R. Krugman: Increasing Returns, Imperfect Competition and the International Economy. Brighton: Wheatsheaf, 1985.
MLA (9th ed.) CitationHelpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade : Increasing Returns, Imperfect Competition and the International Economy / Elhanan Helpman and Paul R. Krugman: Increasing Returns, Imperfect Competition and the International Economy. Wheatsheaf, 1985.