O. M. David-Wayas, J. I. Amuka, C. F. Ezeudeka, I. M. Aii, and M. C. Nwankwo, “Oil Price Volatility and Macroeconomic Performance in Nonoil Exporting Countries in Sub-Saharan Africa”, IJEEP, vol. 11, no. 3, pp. 221–230, Apr. 2021.