World Health Organization. (1998). Health workers manual on family planning options (Second.). World Health Organization.
Chicago Style aipamenaWorld Health Organization. Health Workers Manual on Family Planning Options. Second. Geneva: World Health Organization, 1998.
MLA aipamenaWorld Health Organization. Health Workers Manual on Family Planning Options. Second. World Health Organization, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.