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Dyfyniad Arddull ChicagoParkin, Michael. Microeconomics. 10th ed. Global ed. Boston, Mass: Pearson, 2012.
Dyfyniad MLAParkin, Michael. Microeconomics. 10th ed. Global ed. Pearson, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.