Ehikioya, Benjamin Ighodalo, et al. “Oil Price Fluctuations and Exchange Rate in Selected Sub-Saharan Africa Countries: A Vector Error Correction Model Approach”. International Journal of Energy Economics and Policy, vol. 10, no. 6, Oct. 2020, pp. 242-9, https://econjournals.org.tr/index.php/ijeep/article/view/9822.