B. Collignon and Vezina, M.,
“Independent water and sanitation providers in African cities : a ten-country study : summary”. Water and Sanitation Program - West and Central Africa (WSP-WCA), Abidjan, Ivory Coast, p. 16 p. : boxes, fig., photogr., 2000.
B. Collignon and Vezina, M.,
“Independent water and sanitation providers in African cities : full report of a ten-country study”. World Bank, Washington, DC, USA, p. iv, 64 p. : 8 boxes, 13 fig., 18 tab., 2000.