Yuaningsih, Lilis, R. Adjeng Mariana Febrianti, and Hafiz Waqas Kamran. 2020. “Reducing CO2 Emissions through Biogas, Wind and Solar Energy Production: Evidence from Indonesia”. International Journal of Energy Economics and Policy 10 (6):684-89. https://www.econjournals.com/index.php/ijeep/article/view/10590.