Seeyall, R., I. Hussain, W. U. Hafiz, and B. Mohammadi. “Adoption and Impact of Six Sigma Methodology on Operational Efficiency in Afghanistan With a Focus on Food and Medicine Industry”. Journal of Natural Science Review, vol. 3, no. 4, Dec. 2025, pp. 191-10, doi:10.62810/jnsr.v3i4.260.