Sari, Winda, Suliawati Suliawati, and Bonar Harahap. “Biaya Perawatan Mesin Produksi Es Kristal Menggunakan Metode Preventive Maintenance Policy”. JURNAL UNITEK 16, no. 2 (December 28, 2023): 144–150. Accessed November 25, 2024. https://ejurnal.sttdumai.ac.id/index.php/unitek/article/view/583.