Wirtz, J. Services Marketing: People, Technology, Strategy (9th.). World Scientific.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWirtz, Jochen. Services Marketing: People, Technology, Strategy. 9th. World Scientific.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWirtz, Jochen. Services Marketing: People, Technology, Strategy. 9th. World Scientific.
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