Okoro, H. K. ., R. O. . Asaju, C. O. . Ogunkunle, and K. A. . Basheeru. “Sources, Fate and Degradation of Polycyclic Aromatic Hydrocarbons in the Environment”. Nigerian Journal of Pharmaceutical and Applied Science Research, vol. 9, no. 2, Aug. 2020, pp. 67-75, http://mail.nijophasr.net/index.php/nijophasr/article/view/334.