Biblio

E. Perez, «Evaluating the political economy for pro-poor sanitation investments». Water and Sanitation Program, WSP, Washington, DC, USA, p. 8 p.; 2 fig.; 2 boxes, 2011.

P. Kolsky, Perez, E., Vandersypen, W., y L. Jensen, O., «Sanitation and hygiene at the World Bank : an analysis of current activities», vol. no. 6. World Bank, Washington, DC, USA, p. vii, 19 p. : 4 boxes, 14 fig., 4 tab., 2005.