Não informado. (2002). ACOG educational bulletin. American College of Obstetricians and Gynecologists.
Čikaški stil citiranja (17. izdanje)Não informado. ACOG Educational Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
MLA način citiranja (8. izdanje)Não informado. ACOG Educational Bulletin. American College of Obstetricians and Gynecologists, 2002.
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