WHO -Geneva, CH, World Health Organization and IRC International Water and Sanitation Centre, The Hague, NL,
“Draft guidelines on cost recovery in community water supply and sanitation.”. World Health Organization, Community Water Supply & Sanitation Unit, Geneva, Switzerland, p. iv, 79 p.: fig., tab., 1988.
WHO -Geneva, CH, World Health Organization and IRC International Water and Sanitation Centre, The Hague, NL,
“Projet de directives pour le recouvrement des couts d'approvisionnement en eau et assainissement”. World Health Organization (WHO), Geneva, Switzerland, p. iv, 75 p.: fig., tab., 1988.