Edeme, R. K., N. C. Nkalu, C. Emecheta, and S. Ugwu. “Trade Policies, Exchange Rate and Developing Country’s Real Sector Export Performance”. International Journal of Economics and Financial Issues, vol. 7, no. 2, Apr. 2017, pp. 601-7, https://www.econjournals.com/index.php/ijefi/article/view/4083.