Ikhajiagbe, B., C.C Chijioke-osuji, and J.O Osazee. 2014. “Heavy Metal Contents and Microbial Diversity of Waste Engine Oil-Polluted Soil in Some Public and Commercial Centres in Benin City Metropolis, Nigeria. ”. The Bioscientist Journal 2 (1), 41-53. https://bioscientistjournal.com/index.php/The_Bioscientist/article/view/62.