Elsaghier, M.A., Amer, A.S., Elrifai, R.A. و Elsghier, E.H. 2025. Six Sigma Roles for the Improvement of Company Manufacturing Processes and Waste Reduction. مجلة البحوث الأكاديمية. 29, 2 (2025), 50–61. DOI:https://doi.org/10.65540/jar.v29i2.1248.