Myrick, Jerusha, Tracy Burkhardt, Linda Nelms, Steve Patch, and Robert Yearout. “Professional Perceptions of Six Sigma’s Value”. International Journal of Industrial Engineering: Theory, Applications and Practice 16, no. 3 (August 14, 2009): 234–247. Accessed April 30, 2024. https://journals.sfu.ca/ijietap/index.php/ijie/article/view/269.