Ridzuan, A. R., N. M. Sapuan, N. H. Abd Rahman, H. Borhan, and A. Othman. “The Impact of Corruption on Environmental Quality in the Developing Countries of ASEAN–3: The Application of the Bound Test”. International Journal of Energy Economics and Policy, vol. 9, no. 6, Oct. 2019, pp. 469-78, https://econjournals.com/index.php/ijeep/article/view/8135.