World Health Organization. (2011). The fourth ten years of the World Health Organization 1978-1987. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. The Fourth Ten Years of the World Health Organization 1978-1987. Geneva: World Health Organization, 2011.
Citatione MLA (8a ed.)World Health Organization. The Fourth Ten Years of the World Health Organization 1978-1987. World Health Organization, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.