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Dyfyniad Arddull ChicagoApaya, Alvin, Kenneth Domingo, Jerome Gonzalez, and Alvin Misalucha. A System Study of the Order Entry of Pure Foods Corporation. Diliman, Quezon City: College of Engineering, 1990.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.