P. S. Pamuji and W. Sulistiyowati, “Analysis Of Indo Paket Customer Satisfaction Using Service Quality Method And Root Cause Analysis: Analisis Kepuasan Pelanggan Indo Paket Dengan Menggunakan Metode Service Quality Dan Root Cause Analysis”, ijins, vol. 25, no. 4, p. 10.21070/ijins.v25i4.2391, Oct. 2026.