Zeithaml, V. A. (2006). Services marketing ed.4: Integrating customer focus across the firmValarie A. Zeithaml, Mary Jo Bitner. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रZeithaml, Valarie A. Services Marketing Ed.4: Integrating Customer Focus Across the FirmValarie A. Zeithaml, Mary Jo Bitner. McGraw-Hill, 2006.
एमएलए (8वां संस्करण) प्रशस्ति पत्रZeithaml, Valarie A. Services Marketing Ed.4: Integrating Customer Focus Across the FirmValarie A. Zeithaml, Mary Jo Bitner. McGraw-Hill, 2006.
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