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Dyfyniad Arddull ChicagoWilliams, John. Cim Revision Cards: Marketing Research and Information. Boston: Elsevier, 2004.
Dyfyniad MLAWilliams, John. Cim Revision Cards: Marketing Research and Information. Boston: Elsevier, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.