Biblio

E. Obel-Lawson y Njoroge, B. K., «Small service providers make a big difference», vol. no. 5. World Bank Regional Water and Sanitation Group for East and Southern Africa, Nairobi, Kenya, p. 6 p. : 4 boxes, 6 photogr., 2 tab., 2000.

B. K. Njoroge y Obel-Lawson, E., «Water and sanitation services to the urban poor : small service providers make a big difference in East Africa». Water and Sanitation Program, WSP, Nairobi, Kenya, p. v, 16 p. : 6 tab., 2000.