Usifo, A., A. Adeola, and O. Akinnawo. “Geophysical Exploration for Clay in Igbesa Area and Its Environ, Southwestern Nigeria”. Asian Journal of Geological Research, Vol. 2, no. 2, July 2019, pp. 1-9, http://journalajoger.com/index.php/AJOGER/article/view/30083.