Peelen, E. (2022). Customer Relationship Management. Pearson India Education Services Pvt. ltd.
Lua i Stíl Chicago (17ú heag.)Peelen, Ed. Customer Relationship Management. Noida: Pearson India Education Services Pvt. ltd, 2022.
Lua MLA (9ú heag.)Peelen, Ed. Customer Relationship Management. Pearson India Education Services Pvt. ltd, 2022.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.