Najmiati, N., and H. Patrie. “PENERAPAN ELECTRONIC CUSTOMER RELATIONSHIP MANAGEMENT (E-CRM) PADA THE MEDIA HOTEL AND TOWER”. IDEALIS : InDonEsiA JournaL Information System, Vol. 1, no. 4, Sept. 2018, pp. 269-77, https://jom.fti.budiluhur.ac.id/index.php/IDEALIS/article/view/1170.