World Health Organization. (1999). Reduction of maternal mortality. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Reduction of Maternal Mortality. Geneva: World Health Organization, 1999.
Citatione MLA (8a ed.)World Health Organization. Reduction of Maternal Mortality. World Health Organization, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.