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Dyfyniad Arddull ChicagoMankiw N Gregor. Principles of Microeconomics. 6th. New Delhi: Cengage Learning, 2012.
Dyfyniad MLAMankiw N Gregor. Principles of Microeconomics. 6th. Cengage Learning, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.