Biblio

A. Pruess, Kay, D., Fewtrell, L., and Bartram, J., “Estimating the burden of disease from water, sanitation, and hygiene at a global level”, Environmental health perspectives, pp. p. 537-542 : 3 fig., 6 tab., 2002.

C. Smith, “Water and sanitation are not enough”, Dialogue on diarrhoea, pp. p. 5-6: 1 fig., photogr., 1991.

G. C. Ejezie, “The parasitic diseases of school children in Lagos State, Nigeria”, Acta tropica, pp. p. 79-84 : fig., tab., 1981.