Rahayu, S., P. A. Cakranegara, T. M. Simanjorang, S. Nurul Syobah, and Arifin. “Implementation of Customer Relationship Management System to Maintain Service Quality for Customer”. Enrichment : Journal of Management, Vol. 12, no. 5, Dec. 2022, pp. 3856-6, doi:10.35335/enrichment.v12i5.939.