Saudi, M. H. M., O. Sinaga, and N. H. Jabarullah. “The Role of Renewable, Non-Renewable Energy Consumption and Technology Innovation in Testing Environmental Kuznets Curve in Malaysia”. International Journal of Energy Economics and Policy, vol. 9, no. 1, Dec. 2018, pp. 299-07, https://www.econjournals.com/index.php/ijeep/article/view/7327.