Jaelani, A., S. Firdaus, and J. Jumena. “Renewable Energy Policy in Indonesia: The Qur’anic Scientific Signals in Islamic Economics Perspective”. International Journal of Energy Economics and Policy, vol. 7, no. 4, Sept. 2017, pp. 193-04, https://econjournals.com/index.php/ijeep/article/view/5222.