World Health Organization. (2000). Air quality guidelines for europe (2nd-ed.). World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Air Quality Guidelines for Europe. 2nd-ed. Copenhagen: World Health Organization, 2000.
Citatione MLA (8a ed.)World Health Organization. Air Quality Guidelines for Europe. 2nd-ed. World Health Organization, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.