APA aipamena

World Health Organization. (2011). World health statistics 2011. World Health Organization.

Chicago Style aipamena

World Health Organization. World Health Statistics 2011. Geneva, Switzerland: World Health Organization, 2011.

MLA aipamena

World Health Organization. World Health Statistics 2011. World Health Organization, 2011.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.