Helpman, E., & Krugman, P. R. (1985). Market structure and foreign trade: Increasing returns, imperfect competition, and the international economy. MIT Press.
Цитирование в стиле Чикаго (17-е изд.)Helpman, Elhanan, и Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. Cambridge, Mass.: MIT Press, 1985.
Цитирование MLA (9-е изд.)Helpman, Elhanan, и Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. MIT Press, 1985.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.