Nnaji, Nnabueze Darlington, Kingsley Tochukwu Ughamba, Chiugo Claret Aduba, Kenneth Ejike Ogbonna, and Chukwudi Uzoma Anyanwu. 2020. “Potato Skin: A Potential Bio Stimulating Agent for Used Motor Oil Bio Degraders”. International Journal of Environment, Agriculture and Biotechnology 5 (2). https://journal-repository.com/index.php/ijeab/article/view/1766.