World Health Organization. (1998). Guidelines for drinking - water quality: Recommendations (2nd-edn.). World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Guidelines for Drinking - Water Quality: Recommendations. 2nd-edn. Geneva: World Health Organization, 1998.
Citatione MLA (8a ed.)World Health Organization. Guidelines for Drinking - Water Quality: Recommendations. 2nd-edn. World Health Organization, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.