WHO -Geneva, CH, World Health Organization,
Guidelines for the safe use of wastewater, excreta and greywater. Volume II. Wastewater use in agriculture, 3rd ed.ª ed. Geneva, Switzerland: World Health Organization (WHO), 2006, p. xxiii, 196 p.: fig., tab.
WHO -Geneva, CH, World Health Organization,
Guidelines for the safe use of wastewater, excreta and greywater. Volume I. Policy and regulatory aspects, 3rd ed.ª ed. Geneva, Switzerland: World Health Organization (WHO), 2006, p. xi, 100 p.: fig., tab.
WHO -Geneva, CH, World Health Organization,
Guidelines for the safe use of wastewater, excreta and greywater. Volume IV: Excreta and greywater use in agriculture, 3rd ed.ª ed. Geneva, Switzerland: World Health Organization (WHO), 2006, p. xx, 182 p.: fig., tab.