Mashabai, Ismi, and Andi Mustika Irahayu Asran. “Analysis of Downtime Problems on Elevator Machine at PT. Santosa Utama Lestari Using Tree Diagrams”. SAINTEKBU 15, no. 01 (June 21, 2023): 9–14. Accessed November 22, 2024. https://ejournal.unwaha.ac.id/index.php/saintek/article/view/3258.