Joseph Joel,under the direction of Gupta Vivek. (2005). Harrah's CRM Strategy. ICMR.
Lua i Stíl Chicago (17ú heag.)Joseph Joel,under the direction of Gupta Vivek. Harrah's CRM Strategy. Hyderabad: ICMR, 2005.
Lua MLA (9ú heag.)Joseph Joel,under the direction of Gupta Vivek. Harrah's CRM Strategy. ICMR, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.