Hilton, M. (1993). Assessing the quality of service: Facilitator's guide. Aga Khan Foundation.
Chicago-referens (17:e uppl.)Hilton, Martine. Assessing the Quality of Service: Facilitator's Guide. Washington, DC: Aga Khan Foundation, 1993.
MLA-referens (8:e uppl.)Hilton, Martine. Assessing the Quality of Service: Facilitator's Guide. Aga Khan Foundation, 1993.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.