World Health Organization & ebrary, Inc. (2010). World health statistics. World Health Organization.
Cita Chicago (17th ed.)World Health Organization i Inc ebrary. World Health Statistics. Geneva: World Health Organization, 2010.
Cita MLA (9th ed.)World Health Organization i Inc ebrary. World Health Statistics. World Health Organization, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.