Cita APA (7th ed.)

Krugman, P. R. (1994). Geography and trade. Leuven University Press ; MIT Press.

Cita Chicago (17th ed.)

Krugman, Paul R. Geography and Trade. Leuven, Belgium : Cambridge, Mass.: Leuven University Press ; MIT Press, 1994.

Cita MLA (8th ed.)

Krugman, Paul R. Geography and Trade. Leuven University Press ; MIT Press, 1994.