Utari RE, Andah BD. PENGARUH PENERAPAN ELECTRONIC CUSTOMER RELATIONSHIP MANAGEMENT TERHADAP UPAYA PENINGKATAN LOYALITAS WALI MURID SMK MUHAMMADIYAH 9 JAKARTA. IDEALIS [Internet]. 2018 Jul. 2 [cited 2026 Apr. 8];1(3):390-5. Available from: https://jom.fti.budiluhur.ac.id/IDEALIS/article/view/1276