Dyfyniad APA

Davis, D. R., & Weinstein, D. E. (1998). market access, economic geography and comparative advantage: An empirical assessment. National Bureau of Economic Research.

Dyfyniad Arddull Chicago

Davis, Donald R., and David E. Weinstein. Market Access, Economic Geography and Comparative Advantage: An Empirical Assessment. Cambridge: National Bureau of Economic Research, 1998.

Dyfyniad MLA

Davis, Donald R., and David E. Weinstein. Market Access, Economic Geography and Comparative Advantage: An Empirical Assessment. National Bureau of Economic Research, 1998.

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