Isabella, Okeke, Anike, Okechukwu, Ezeh, Hilary, and Okoyeh, Ifeyinwa. “Stable Isotope Geochemistry and Ore Genesis of Ishiagu Galena-Sphalerite Mineralization, Southeastern Nigeria”. Asian Journal of Geological Research 1, no. 3 (January 22, 2019): 1-11. Accessed January 20, 2020. http://journalajoger.com/index.php/AJOGER/article/view/29606.