Bewana, Zanuar Galang, et al. “Proposed Policy Preventive Maintenance Machine Moriseiki NH 4000 DCG Method of Reliability Center Maintenance (RCM) And Risk Based Maintenance (RBM) Case Study PT Pudak Scientific”. International Journal of Innovation in Enterprise System, vol. 2, no. 2, July 2018, pp. 9-17, https://ijies.telkomuniversity.ac.id/index.php/IJIES/article/view/20.