Ujuanbi, O., and M. B. Asokhia. “Search of Clay Deposits in a Dual Geological Environment in the South-Southern Part of Nigeria”. Biological Sciences - PJSIR 49, no. 1 (February 24, 2006): 12–18. Accessed May 15, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1102.