Kaufman, R. (2012). Uplifting service: The proven path to delighting your customers, colleagues, and everyone else you meet (NA.). Evolve Publishing.
Lua i Stíl Chicago (17ú heag.)Kaufman, Ron. Uplifting Service: The Proven Path to Delighting Your Customers, Colleagues, and Everyone Else You Meet. NA. USA: Evolve Publishing, 2012.
Lua MLA (9ú heag.)Kaufman, Ron. Uplifting Service: The Proven Path to Delighting Your Customers, Colleagues, and Everyone Else You Meet. NA. Evolve Publishing, 2012.
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