Maulani Puja kusuma C, Ferdian Shobur A. The Development of an ITIL-Based Customer Service Complaint Handling System. Jurnal Pustaka Data [Internet]. 31 Agustus 2026 [dikutip 13 September 2026];6(4):650 -. Tersedia pada: https://jurnal.pustakagalerimandiri.co.id/index.php/pustakadata/article/view/2015