Fatma, N., Ponda, H. and Kuswara, R. 2020. ANALISIS PREVENTIVE MAINTENANCE DENGAN METODE MENGHITUNG MEAN TIME BETWEEN FAILURE (MTBF) DAN MEAN TIME TO REPAIR (MTTR) (STUDI KASUS PT. GAJAH TUNGGAL TBK). Heuristic. 17, 2 (Oct. 2020), 87-94. DOI:https://doi.org/10.30996/heuristic.v17i2.4648.