World Health Organization UNICEF EDC. (2003). WHO information series on School health: Document eight. World Health Organization.
Cita Chicago (17th ed.)World Health Organization UNICEF EDC. WHO Information Series on School Health: Document Eight. Geneva: World Health Organization, 2003.
Cita MLA (8th ed.)World Health Organization UNICEF EDC. WHO Information Series on School Health: Document Eight. World Health Organization, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.