“ANALISIS KUALITAS PELAYANAN PT. LION GROUP MENGGUNAKAN METODE IMPORTANCE PERFORMANCE ANALYSIS (IPA)”, jopt, vol. 20, no. 2, hlm. 79–91, Nov 2023, Diakses: Okt 03, 2026. Tersedia pada: https://jurnal.stieieu.ac.id/index.php/opt/article/view/163