Ezeaku, H. C., N. J. Modebe, G. C. Eje, and A. E. Ageme. “Oil Price and Exchange Rate Nexus: A Vector Error Correction Approach on Nigeria”. International Journal of Energy Economics and Policy, vol. 7, no. 4, Sept. 2017, pp. 31-37, https://www.econjournals.com/index.php/ijeep/article/view/4964.