P.A, S., and R.-E. I.A. “Septic Tanks Contamination on Groundwater Quality Around Elementary Schoolsin Ibadan,Oyo State Nigeria”. Federal Polytechnic Ilaro Journal of Pure And Applied Sciences, vol. 4, no. 2, Dec. 2022, pp. 85-95, https://fepi-jopas.federalpolyilaro.edu.ng/index.php/journal/article/view/83.