World Health organization. (2006). Guidelines for drinking - water quality: Recommendations. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health organization. Guidelines for Drinking - Water Quality: Recommendations. Geneva: World Health Organization, 2006.
Citatione MLA (8a ed.)World Health organization. Guidelines for Drinking - Water Quality: Recommendations. World Health Organization, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.