Arimieari, L. W., Hart, I. E., and Lucky, J. O. “Evaluation of Groundwater Quality Using Normal Statistical Probability Distribution in Egwi Etche, Rivers State, Nigeria”. Journal of Environmental Engineering and Studies (March 27, 2024): 44–56. Accessed October 1, 2025. https://matjournals.net/engineering/index.php/JoEES/article/view/221.