Rokhmawati, A., N. Weniagustin, F. Fitri, H. Haryetti, and I. A. Yafiz. “Regulation of Reducing Carbon Emissions: Is It Effectively Implemented to Develop Competitiveness of Indonesian Manufacturing Firms?”. International Journal of Energy Economics and Policy, vol. 8, no. 6, Oct. 2018, pp. 258-66, https://www.econjournals.com/index.php/ijeep/article/view/7076.