L Thiruvarasu Letchumanan, Noordin Mohd Yusof, Hamed Gholami, and Nor Hasrul Akhmal Bin Ngadiman. “Green Lean Six Sigma: A Review”. Journal of Advanced Research in Technology and Innovation Management 1, no. 1 (December 19, 2021): 33–40. Accessed December 4, 2024. https://akademiabaru.com/submit/index.php/jartim/article/view/4398.