APA (7th ed.) Citation

Helpman, E., & Krugman, P. R. (1989). Trade policy and market structure. MIT Press.

Chicago Style (17th ed.) Citation

Helpman, Elhanan, and Paul R. Krugman. Trade Policy and Market Structure. Cambridge, Mass: MIT Press, 1989.

MLA (9th ed.) Citation

Helpman, Elhanan, and Paul R. Krugman. Trade Policy and Market Structure. MIT Press, 1989.

Warning: These citations may not always be 100% accurate.