Aderemi, T. A., O. A. Adebola, W. D. Olanipekun, O. O. Peter, A. G. Bamidele, and A. D. Ezinwa. “Human Capital Development, Energy Consumption and Crude Oil Exports in Nigeria: Implications for Sustainable Development”. International Journal of Energy Economics and Policy, vol. 11, no. 4, June 2021, pp. 443-9, https://www.econjournals.com/index.php/ijeep/article/view/8488.