Gonzalez-Polio, E.

Bamberger, M., Gonzalez-Polio, E. & Sae-Hau, U., 1982. Evaluation of sites and services projects : the evidence from El Salvador, Washington, DC, USA: World Bank. Available at: https://www.ircwash.org/sites/default/files/Bamberger-1982-Evaluation.pdf.