Jaelani, A., L. Layaman, D. Fatmasari, A. D. Salikin, and A. Salam Dz. “Energy Conservation and Energy Management for Industry in Indonesia in Islamic Economic Perspective”. International Journal of Energy Economics and Policy, vol. 10, no. 3, Mar. 2020, pp. 239-4, https://www.econjournals.com/index.php/ijeep/article/view/9061.