Não informado. (2002). ACOG Practice Bulletin. American College of Obstetricians and Gynecologists.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. ACOG Practice Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. ACOG Practice Bulletin. American College of Obstetricians and Gynecologists, 2002.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.