World Health Organization. (2000). Healthy ageing development. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Healthy Ageing Development. Geneva: World Health Organization, 2000.
Citatione MLA (8a ed.)World Health Organization. Healthy Ageing Development. World Health Organization, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.