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Dyfyniad Arddull ChicagoDavis, Donald R., and David E. Weinstein. Market Access, Economic Geography and Comparative Advantage: An Empirical Assessment. Cambridge: National Bureau of Economic Research, 1998.
Dyfyniad MLADavis, Donald R., and David E. Weinstein. Market Access, Economic Geography and Comparative Advantage: An Empirical Assessment. National Bureau of Economic Research, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.