World Health Organization. (1998). Health workers manual on family planning options (Second.). World Health Organization.
Chicago-Zitierstil (17. Ausg.)World Health Organization. Health Workers Manual on Family Planning Options. Second. Geneva: World Health Organization, 1998.
MLA-Zitierstil (8. Ausg.)World Health Organization. Health Workers Manual on Family Planning Options. Second. World Health Organization, 1998.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.