Oluchukwu F, A. ., A. . Innocent I, and E. . Ogochukwu S. “Sustainable Sources of Energy and the Expected Benefits to Nigerian Economy”. International Journal of Sustainable Energy and Environmental Research, vol. 3, no. 2, June 2014, pp. 110-2, https://archive.conscientiabeam.com/index.php/13/article/view/2094.