World Health Organization. (2011). Guidelines for drinking-water quality (4th.). World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Guidelines for Drinking-water Quality. 4th. Geneva, Switzerland: World Health Organization, 2011.
Citatione MLA (8a ed.)World Health Organization. Guidelines for Drinking-water Quality. 4th. World Health Organization, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.