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Dyfyniad Arddull ChicagoMankiw, N. Gregory. Essentials of Economics. 6th ed. Australia ; Mason, OH: South-Western Cengage Learning, 2012.
Dyfyniad MLAMankiw, N. Gregory. Essentials of Economics. 6th ed. South-Western Cengage Learning, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.