APA (7th ed.) Zitazioa
(2000). Air quality guidelines for Europe (Second edition.). World Health Organization Regional Office for Europe.
Chicago Style (17th ed.) Zitazioa
Air Quality Guidelines for Europe. Second edition. Copenhagen, Denmark: World Health Organization Regional Office for Europe, 2000.
MLA (9th ed.) Zitazioa
Air Quality Guidelines for Europe. Second edition. World Health Organization Regional Office for Europe, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.