Okpoko, Ephraim, et al. “Evaluation of The Geology, Water Resources and Geotechnical Properties of Soils in Uga Area, Southeastern Nigeria”. Coou African Journal of Environmental Research, vol. 1, no. 2, Feb. 2019, pp. 103-45, http://ajer.coou.edu.ng/index.php/journal/article/view/27.