Peelen, E. (2018). Customer Relationship Management. Pearson Education India Pvt. Ltd.
Lua i Stíl Chicago (17ú heag.)Peelen, Ed. Customer Relationship Management. New Delhi: Pearson Education India Pvt. Ltd, 2018.
Lua MLA (9ú heag.)Peelen, Ed. Customer Relationship Management. Pearson Education India Pvt. Ltd, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.