HABIBIE, Malik Aziz; TRIYONO, Gandung. RANCANGAN E-CRM DALAM MENINGKATKAN LOYALITAS DAN PELAYANAN TERHADAP JAMAAH UMROH STUDI KASUS: DARUL QUR’AN (DAQU) TOUR & TRAVEL. IDEALIS : InDonEsiA journaL Information System, [S. l.], v. 1, n. 3, p. 372–378, 2018. Disponível em: https://jom.fti.budiluhur.ac.id/IDEALIS/article/view/1273. Acesso em: 31 jul. 2025.