Kaufman, R. (2012). Uplifting service: The proven path to delighting your customers, colleagues, and everyone else you meet.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKaufman, Ron. Uplifting Service: The Proven Path to Delighting Your Customers, Colleagues, and Everyone Else You Meet. 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKaufman, Ron. Uplifting Service: The Proven Path to Delighting Your Customers, Colleagues, and Everyone Else You Meet. 2012.
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