World Health Organization. (2011). World malaria report 2011. World Health Organization.
Chicago Style aipamenaWorld Health Organization. World Malaria Report 2011. Geneva, Switzerland: World Health Organization, 2011.
MLA aipamenaWorld Health Organization. World Malaria Report 2011. World Health Organization, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.