Okey-Wokeh, C. G., and Kenneth Woken Okechukwu. “Determination of Heavy Metal Levels in Surface Water and Sediment of Mini-Ezi Stream, Elele-Alimini, Rivers State, Nigeria”. African Journal of Pure and Applied Sciences, vol. 3, no. 1, May 2022, pp. 136-43, https://journal.ku.ac.ke/index.php/AJPAS/article/view/259.