Zamri, and G. Sirait. “ANALISIS PENERAPAN PREVENTIVE MAINTENANCE MESIN PRINTING DI PT. ABC”. Computer and Science Industrial Engineering (COMASIE), vol. 6, no. 4, July 2022, pp. 118-26, https://ejournal.upbatam.ac.id/index.php/comasiejournal/article/view/5350.