Shah Krupa. Retail Loyalty Programs. MBA CORE;2005.
Lua i Stíl Chicago (17ú heag.)Shah Krupa. Retail Loyalty Programs. : MBA CORE;2005.
Lua MLA (9ú heag.)Shah Krupa. Retail Loyalty Programs. MBA CORE;2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.