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Dyfyniad Arddull ChicagoWhalley, John. Developing Countries and the Global Trading System. Ann Arbor: University of Michigan Press, 1989.
Dyfyniad MLAWhalley, John. Developing Countries and the Global Trading System. University of Michigan Press, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.