Kumar, V. (2008). Managing Customers for Profit: Strategies to Increase Profits and Build Loyalty. Pearson Education India Pvt. Ltd.
Lua i Stíl Chicago (17ú heag.)Kumar, V. Managing Customers for Profit: Strategies to Increase Profits and Build Loyalty. New Delhi: Pearson Education India Pvt. Ltd, 2008.
Lua MLA (9ú heag.)Kumar, V. Managing Customers for Profit: Strategies to Increase Profits and Build Loyalty. Pearson Education India Pvt. Ltd, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.