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.
Atenció: Aquestes cites poden no estar 100% correctes.