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Dyfyniad Arddull ChicagoSPECHLER, Martin. Perspectives Economic Thought. McGraw-Hill, 1990.
Dyfyniad MLASPECHLER, Martin. Perspectives Economic Thought. McGraw-Hill, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.