APA (7th ed.) Citation
Helpman, E., & Krugman, P. R. (1989). Trade Policy and Market Structure (1. ed.). The MIT Press.
Chicago Style (17th ed.) Citation
Helpman, Elhanan, and Paul R. Krugman. Trade Policy and Market Structure. 1. ed. Cambridge: The MIT Press, 1989.
MLA (9th ed.) Citation
Helpman, Elhanan, and Paul R. Krugman. Trade Policy and Market Structure. 1. ed. The MIT Press, 1989.
Warning: These citations may not always be 100% accurate.