World Health Organization. (2011). The fourth ten years of the World Health Organization 1978-1987. World Health Organization.
Chicago-viite (17. p.)World Health Organization. The Fourth Ten Years of the World Health Organization 1978-1987. Geneva: World Health Organization, 2011.
MLA-viite (8. p.)World Health Organization. The Fourth Ten Years of the World Health Organization 1978-1987. World Health Organization, 2011.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.