World Health Organization. (2012). World health statistics 2012. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. World Health Statistics 2012. Geneva, Switzerland: World Health Organization, 2012.
Citatione MLA (8a ed.)World Health Organization. World Health Statistics 2012. World Health Organization, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.