Purwono, Agung, Muhardono Muhardono, and Azhar Hermawan Ryanto. “Analysis of Monthly Maintenance Performance (P1, P3, P6) Commuter Line Dipo Depok”. Jurnal Perkeretaapian Indonesia (Indonesian Railway Journal) 3, no. 1 (November 20, 2018). Accessed June 4, 2026. https://jurnal.ppi.ac.id/jpi/article/view/73.