Padios, Jassiel, Raven Gulmatico, Joemarie Dela Cruz, Joemarie Cruz, Karl Franz Agustino, and Kliezer Jane Valle. “Development of a PET Bottle Collection System for a Green Campus Community”. International Journal of Synergy in Engineering and Technology 2, no. 2 (December 30, 2021): 113-124. Accessed October 29, 2025. https://ijset.tatiuc.edu.my/index.php/ijset/article/view/110.