Dr. A. Dami, et al. “Physico-Chemical and Bacterialogical Analysis of the Surface Water Used for Domestic Purposes in Okpai and Beneku, Delta State, Nigeria”. Global Journal of Human-Social Science, vol. 12, no. B13, Oct. 2012, pp. 31-36, https://socialscienceresearch.org/index.php/GJHSS/article/view/451.