Osabuohien, E. S., A. O. Soogun, and E. Urhie. “Examining the Relative Roles of Domestic and Foreign Direct Investments in Nigeria”. International Journal of Economics and Financial Issues, vol. 7, no. 4, Aug. 2017, pp. 365-71, https://econjournals.com/index.php/ijefi/article/view/2753.