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Dyfyniad Arddull ChicagoGerber, James. International Economics. New York: Pearson Addison Wesley, 2005.
Dyfyniad MLAGerber, James. International Economics. New York: Pearson Addison Wesley, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.