Siregar, M. Tirtana, and Gilang Yoga Samodra. “Analysis of Service Delivery Improvement of Manufactured Products With Lean Method Management”. Journal of Management Science & Engineering Research 3, no. 2 (February 9, 2021): 26–30. Accessed May 6, 2024. https://journals.bilpubgroup.com/index.php/jmser/article/view/2620.