Okoye, B., C. Umeora, O. Ifebi, and C. Onwuzuligbo. “Effects Of Sewage Disposal Systems On The Environment In Public Housing Estates In Enugu Metropolis”. Coou African Journal of Environmental Research, vol. 1, no. 1, Mar. 2018, pp. 120-3, http://ajer.coou.edu.ng/index.php/journal/article/view/79.