Ogah , C. O., I. O. Adetifa, and B. . K. A. “Pharmaceuticals in the Environment: Levels of Selected Drugs in Water in Lagos, Nigeria”. Nigerian Journal of Pharmaceutical and Applied Science Research, vol. 9, no. 2, Aug. 2020, pp. 13-18, http://mail.nijophasr.net/index.php/nijophasr/article/view/338.