Murdifin, I., M. F. A. Pelu, A. A. H. P. K. Putra, A. M. Arumbarkah, M. Muslim, and A. Rahmah. “Environmental Disclosure As Corporate Social Responsibility: Evidence from the Biggest Nickel Mining in Indonesia”. International Journal of Energy Economics and Policy, vol. 9, no. 1, Dec. 2018, pp. 115-22, https://www.econjournals.com/index.php/ijeep/article/view/7048.