C. Miruka, A., D. K. Kariuki, A. O. Yusuf, and J. O. Onyatta. “Efficiency of a Wastewater Treatment Plant in the City of Nairobi”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 38, no. 1, Apr. 2018, pp. 152-6, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8751.