Piedad Jr., Eduardo D. “Various Trends on the National Development of Renewable Energy Source Affecting the Natural Resource Depletion”. Recoletos Multidisciplinary Research Journal 4, no. 1 (June 30, 2016). Accessed April 27, 2024. https://rmrj.usjr.edu.ph/rmrj/index.php/RMRJ/article/view/173.