World Health Organization. (1998). Health workers manual on family planning options (Second.). World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Health Workers Manual on Family Planning Options. Second. Geneva: World Health Organization, 1998.
Citatione MLA (8a ed.)World Health Organization. Health Workers Manual on Family Planning Options. Second. World Health Organization, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.