NYABAYO, C. J.; LITI , D. Human Faecal Matter as a Contaminant of Well Water Sources in Kisii Municipality. East African Journal of Pure and Applied Sciences, [S. l.], v. 2, n. 1, p. Pg 61–72, 2012. Disponível em: http://ojs.uoeld.ac.ke/index.php/eapas/article/view/227. Acesso em: 21 dec. 2024.