Setiawan, Indra, and Fransisca Debora. “A Systematic Literature Review of Implementation Six Sigma in Manufacturing Industries”. Operations Excellence: Journal of Applied Industrial Engineering 12, no. 3 (November 9, 2020): 318–331. Accessed June 29, 2026. https://publikasi.mercubuana.ac.id/index.php/oe/article/view/9906.