Cita APA

Helpman, E., & Krugman, P. R. (1985). Market structure and foreing trade. Cambridge: MIT Press.

Citación estilo Chicago

Helpman, Elhanan, and Paul R. Krugman. Market Structure and Foreing Trade. Cambridge: MIT Press, 1985.

Cita MLA

Helpman, Elhanan, and Paul R. Krugman. Market Structure and Foreing Trade. Cambridge: MIT Press, 1985.