Hidayat, M. M., E. Prasetyo, and F. A. Damayanti. “Heavy Equipment Spare Parts Inventory System Using the Tsukamoto Method (case Study of PT Berkah Industry Lifting Machinery)”. Jurnal Mandiri IT, vol. 11, no. 3, Jan. 2023, pp. 101-8, https://www.ejournal.isha.or.id/index.php/Mandiri/article/view/174.