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Dyfyniad Arddull ChicagoYang Kai. Voice of the Customer: Capture and Analysis. U.S.A: MC Graw Hill, 2008.
Dyfyniad MLAYang Kai. Voice of the Customer: Capture and Analysis. U.S.A: MC Graw Hill, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.