Fitriana, S. ., Darmawan, R. ., Utami, H. ., Fedrina, R. ., & Agustin, R. . (2022). Analysis of Customer Relationship Management (CRM) System in Sales of Plus Hajj Product in PT. Fajrul Ikhsan Wisata (ESQ Tours Travel). ICHELSS: International Conference on Humanities, Education, Law, and Social Sciences, 2(1), 953–961. Retrieved from https://journal.unj.ac.id/unj/index.php/hispisi/article/view/31004