AP Putra, Ari, Erlinda Erlinda, and M Yusfahmi. “Sales System in the Endocell Mobile Phone Business Using the CRM (Customer Relationship Management) Method) in Kompe Berangin Village, Cerenti District”. JURNAL TEKNOLOGI DAN OPEN SOURCE 7, no. 1 (November 14, 2024): 10 - 21. Accessed July 19, 2025. http://ejournal.uniks.ac.id/index.php/JTOS/article/view/3860.