Não informado. (2002). ACOG technical bulletin. American College of Obstetricians and Gynecologists.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. ACOG Technical Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. ACOG Technical Bulletin. American College of Obstetricians and Gynecologists, 2002.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.