Kaufman, R. (2012). Uplifting service: The proven path to delighting your customers, colleagues, and everyone else you meet (NA.). Evolve Publishing.
Citazione stile Chigago Style (17a edizione)Kaufman, Ron. Uplifting Service: The Proven Path to Delighting Your Customers, Colleagues, and Everyone Else You Meet. NA. USA: Evolve Publishing, 2012.
Citatione MLA (9a ed.)Kaufman, Ron. Uplifting Service: The Proven Path to Delighting Your Customers, Colleagues, and Everyone Else You Meet. NA. Evolve Publishing, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.