APA Edition Citation

Helpman, E., & Krugman, P. R. (1985). Market structure and foreign trade: Increasing returns, imperfect competition and the international economy. M I T.

Chicago Edition Citation

Helpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition and the International Economy. Cambridge: M I T, 1985.

MLA Edition Citation

Helpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition and the International Economy. M I T, 1985.