Zeithaml, V. A. (2006). Services marketing ed.4: Integrating customer focus across the firmValarie A. Zeithaml, Mary Jo Bitner. McGraw-Hill.
Dyfyniad Arddull ChicagoZeithaml, Valarie A. Services Marketing Ed.4: Integrating Customer Focus Across the FirmValarie A. Zeithaml, Mary Jo Bitner. McGraw-Hill, 2006.
Dyfyniad MLAZeithaml, Valarie A. Services Marketing Ed.4: Integrating Customer Focus Across the FirmValarie A. Zeithaml, Mary Jo Bitner. McGraw-Hill, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.