(2000). Air quality guidelines for Europe (Second edition.). World Health Organization Regional Office for Europe.
Citazione stile Chigago Style (17a edizione)Air Quality Guidelines for Europe. Second edition. Copenhagen, Denmark: World Health Organization Regional Office for Europe, 2000.
Citatione MLA (9a ed.)Air Quality Guidelines for Europe. Second edition. World Health Organization Regional Office for Europe, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.