Alokla, Mosa, Mais Alkhateeb, Muneer Abbad, and Faten Jaber. “Customer Relationship Management: A Review and Classification”. Transnational Marketing Journal 7, no. 2 (October 2, 2019): 187–210. Accessed January 23, 2022. https://journals.tplondon.com/tmj/article/view/734.