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Dyfyniad Arddull ChicagoDean, Joel. Managerial Economics. New Delhi: Prentice hall of India private ltd, 1968.
Dyfyniad MLADean, Joel. Managerial Economics. Prentice hall of India private ltd, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.