APA (7th ed.) Zitazioa
World Health Organization & ebrary, Inc. (2006). Policy and regulatory aspects. World Health Organization.
Chicago Style (17th ed.) Zitazioa
World Health Organization eta Inc ebrary. Policy and Regulatory Aspects. Geneva: World Health Organization, 2006.
MLA (9th ed.) Zitazioa
World Health Organization eta Inc ebrary. Policy and Regulatory Aspects. World Health Organization, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.