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Dyfyniad Arddull ChicagoTschohl, John. E-Service: Speed, Technology and Price Built Around Service. New Delhi: Pentagon, 2003.
Dyfyniad MLATschohl, John. E-Service: Speed, Technology and Price Built Around Service. Pentagon, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.