APA (7th ed.) Zitazioa
World Health Organization. (2019). European tobacco use. Trends report 2019. World Health Organization Regional Office for Europe.
Chicago Style (17th ed.) Zitazioa
World Health Organization. European Tobacco Use. Trends Report 2019. Copenhague: World Health Organization Regional Office for Europe, 2019.
MLA (9th ed.) Zitazioa
World Health Organization. European Tobacco Use. Trends Report 2019. World Health Organization Regional Office for Europe, 2019.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.