Kurnia, Hibarkah, et al. “Lean Six Sigma: Literature Review and Implementation for Textile and Textile Product (TTP) Industries”. Proceeding Mercu Buana Conference on Industrial Engineering, vol. 3, no. 1, June 2021, pp. 1-10, https://publikasi.mercubuana.ac.id/index.php/mbcie/article/view/20294.