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Dyfyniad Arddull ChicagoApte, Govind. Services Marketing. New Jersey: John Wiley & Sons, 2004.
Dyfyniad MLAApte, Govind. Services Marketing. John Wiley & Sons, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.