SETYANINGRUM, Ika Rizky; SITORUS, Palti Marulitua. Efficiency Measurement of Maintenance Costs on Customer Service Process PT Indonesia Comnets Plus West Java. TRIKONOMIKA : Jurnal Ekonomi, [S. l.], v. 14, n. 2, p. 138–142, 2015. DOI: 10.23969/trikonomika.v14i2.411. Disponível em: https://journal.unpas.ac.id/index.php/trikonomika/article/view/411. Acesso em: 10 mar. 2025.