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  1. ↑ "Pregnancy Labor and Birth". Office on Women's Health, U.S. Department of Health and Human Services. 1 February 2017. Diarkibkan daripada yang asal pada 28 July 2017. Dicapai pada 15 July 2017. Rencana ini mengandungi teks dari sumber yang berada dalam domain awam.
  2. ↑ "Safe Prevention of the Primary Cesarean Delivery". American Congress of Obstetricians and Gynecologists and the Society for Maternal-Fetal Medicine. March 2014. Dicapai pada 23 January 2022.