UTARI, Retno Endah; ANDAH, Bullion Dragon. PENGARUH PENERAPAN ELECTRONIC CUSTOMER RELATIONSHIP MANAGEMENT TERHADAP UPAYA PENINGKATAN LOYALITAS WALI MURID SMK MUHAMMADIYAH 9 JAKARTA. IDEALIS : InDonEsiA journaL Information System, [S. l.], v. 1, n. 3, p. 390–395, 2018. Disponível em: https://jom.fti.budiluhur.ac.id/IDEALIS/article/view/1276. Acesso em: 8 apr. 2026.