Prolan D Dizon, Erica Jane Agustin, Sam Carlo Ladores, Rick Donald Manzon, and Lori Espinoza Pascual. “Application of DMAIC Methodology to Improve the Non-Technical Loss Reduction Process in Nueva Ecija II Electric Cooperative, Inc, Area 1”. International Journal of Progressive Research in Science and Engineering, vol. 2, no. 5, May 2021, pp. 28-33, https://journal.ijprse.com/index.php/ijprse/article/view/265.