Winarno, Heru. “PERAWATAN ALAT (HEAVY EQUIPMENT) DENGAN PENJADWALAN MENGGUNAKAN METODE PREVENTIVE MAINTENANCE DI PT PURNA BAJA HARSCO”. ReTII00 (January 16, 2017). Accessed April 28, 2024. //journal.itny.ac.id/index.php/ReTII/article/view/354.