World Health Organization. (2000). Air quality guidelines for europe (2nd-ed.). World Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. Air Quality Guidelines for Europe. 2nd-ed. Copenhagen: World Health Organization, 2000.
MLA-referens (8:e uppl.)World Health Organization. Air Quality Guidelines for Europe. 2nd-ed. World Health Organization, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.