Jocson, Engr. Joefil C., and Robert J. Tinio. “Application of Lean Methodology to Increase Productivity through Value Stream Mapping”. Engineering And Technology Journal 6, no. 9 (September 20, 2021): 1024–1027. Accessed July 22, 2024. https://everant.org/index.php/etj/article/view/515.