McCoy, G. (2005). Extraordinary customer service. Jaico Pub House.
Dyfyniad Arddull ChicagoMcCoy, G. Extraordinary Customer Service. Mumbai: Jaico Pub House, 2005.
Dyfyniad MLAMcCoy, G. Extraordinary Customer Service. Jaico Pub House, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.