Cita APA

Helpman, E. 1., & Krugman, P. R. 1. (1989). Trade policy and market structure. Cambridge, Massachusetts: The MIT Press.

Citación estilo Chicago

Helpman, Elhanan 1943-, y Paul Robin 1953- Krugman. Trade Policy and Market Structure. Cambridge, Massachusetts: The MIT Press, 1989.

Cita MLA

Helpman, Elhanan 1943-, y Paul Robin 1953- Krugman. Trade Policy and Market Structure. Cambridge, Massachusetts: The MIT Press, 1989.