(2007). World health statistics 2007 <i>en</i>.
Cita Chicago (17th ed.)World Health Statistics 2007 <i>en</i>. 2007.
Cita MLA (9th ed.)World Health Statistics 2007 <i>en</i>. 2007.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)