APA (7th ed.) Citation

Helpman, E., & Krugman, P. R. (1986). Market structure and foreign trade: Increasing returns, imperfect competition, and the internat. economy (3. pr.). MIT Pr.

Chicago Style (17th ed.) Citation

Helpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the Internat. Economy. 3. pr. Cambridge, Mass. u.a: MIT Pr, 1986.

MLA (9th ed.) Citation

Helpman, Elhanan, and Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the Internat. Economy. 3. pr. MIT Pr, 1986.