Zeithaml, V. A. (2013). Services marketing: Integrating customer focus across the firm 7th ed. Mc GrawHill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रZeithaml, Valarie A. Services Marketing: Integrating Customer Focus Across the Firm 7th Ed. Mc GrawHill, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रZeithaml, Valarie A. Services Marketing: Integrating Customer Focus Across the Firm 7th Ed. Mc GrawHill, 2013.
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