John Michael Sasan, Jenevive Kin Camangyan, Mj Ego-ogan, Bea Bautista, Kim Surio, and Emmanuel Niño Villanueva. “Utilization of Waste Low Density Polyethylene for Cement Brick”. International Journal of Progressive Research in Science and Engineering, vol. 2, no. 12, Dec. 2021, pp. 7-11, https://journal.ijprse.com/index.php/ijprse/article/view/479.