E., Nnabuife, and Ohue, P. I. “Lean Six Sigma Manufacturing and Performance of Brewing Firms in South-South, Nigeria”. The International Journal of Business & Management 9, no. 10 (October 31, 2021). Accessed May 19, 2024. https://www.internationaljournalcorner.com/index.php/theijbm/article/view/166999.