JAMALUDIN, Jamaludin; ASTUTI, Septiana Widi. Kajian Biaya Operasi Kereta Api. Jurnal Perkeretaapian Indonesia (Indonesian Railway Journal), [S. l.], v. 2, n. 1, p. 56–65, 2018. DOI: 10.37367/jpi.v2i1.46. Disponível em: https://jurnal.ppi.ac.id/jpi/article/view/46. Acesso em: 4 jun. 2026.