WHO. (1987). Mechanism of action, safety and efficacy of intrauterine devices. Geneva.
Chicago Style aipamenaWHO. Mechanism of Action, Safety and Efficacy of Intrauterine Devices. Geneva, 1987.
MLA aipamenaWHO. Mechanism of Action, Safety and Efficacy of Intrauterine Devices. Geneva, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.