APA (7th ed.) Citation

Krugman, P. R. (1985). Increasing returns and the theory of international trade.

Chicago Style (17th ed.) Citation

Krugman, Paul R. Increasing Returns and the Theory of International Trade. Cambridge, Mass, 1985.

MLA (9th ed.) Citation

Krugman, Paul R. Increasing Returns and the Theory of International Trade. 1985.