Shajahan, S. (2005). Service markeitng (2nd ed.). Himalaya.
Lua i Stíl Chicago (17ú heag.)Shajahan, S. Service Markeitng. 2nd ed. Mumbai: Himalaya, 2005.
Lua MLA (9ú heag.)Shajahan, S. Service Markeitng. 2nd ed. Himalaya, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.