Gylych, J., A. A. Jbrin, B. Celik, and A. Isik. “The Effect of Oil Price Fluctuation on the Economy of Nigeria”. International Journal of Energy Economics and Policy, vol. 10, no. 5, Aug. 2020, pp. 461-8, https://www.econjournals.com/index.php/ijeep/article/view/9493.