Okoye, Boniface, Chukwunonso Umeora, Oluchi Ifebi, and Chijioke Onwuzuligbo. 2018. “Effects Of Sewage Disposal Systems On The Environment In Public Housing Estates In Enugu Metropolis”. Coou African Journal of Environmental Research 1 (1):120-30. https://ajer.coou.edu.ng/index.php/journal/article/view/79.