Sugandhi, R. (2008). Customer relationship management.
Lua i Stíl Chicago (17ú heag.)Sugandhi, R.K. Customer Relationship Management. New Delhi, 2008.
Lua MLA (9ú heag.)Sugandhi, R.K. Customer Relationship Management. 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.