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Dyfyniad Arddull ChicagoPugel, Thomas. International Economics. 14th ed. Boston: McGraw-Hill, 2009.
Dyfyniad MLAPugel, Thomas. International Economics. 14th ed. McGraw-Hill, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.