McDonald SJ, Middleton P, Dowswell T, Morris PS (јул 2013). „Effect of timing of umbilical cord clamping of term infants on maternal and neonatal outcomes”. The Cochrane Database of Systematic Reviews. 7 (7): CD004074. PMID23843134. doi:10.1002/14651858.CD004074.pub3.
Hofmeyr GJ, Hannah M, Lawrie TA (јул 2015). „Planned caesarean section for term breech delivery”. The Cochrane Database of Systematic Reviews (7): CD000166. PMID26196961. doi:10.1002/14651858.CD000166.pub2.
Molina G, Weiser TG, Lipsitz SR, Esquivel MM, Uribe-Leitz T, Azad T, Shah N, Semrau K, Berry WR, Gawande AA, Haynes AB (децембар 2015). „Relationship Between Cesarean Delivery Rate and Maternal and Neonatal Mortality”. JAMA. 314 (21): 2263—70. PMID26624825. doi:10.1001/jama.2015.15553.
McDonald SJ, Middleton P, Dowswell T, Morris PS (јул 2013). „Effect of timing of umbilical cord clamping of term infants on maternal and neonatal outcomes”. The Cochrane Database of Systematic Reviews. 7 (7): CD004074. PMID23843134. doi:10.1002/14651858.CD004074.pub3.
Hofmeyr GJ, Hannah M, Lawrie TA (јул 2015). „Planned caesarean section for term breech delivery”. The Cochrane Database of Systematic Reviews (7): CD000166. PMID26196961. doi:10.1002/14651858.CD000166.pub2.
Molina G, Weiser TG, Lipsitz SR, Esquivel MM, Uribe-Leitz T, Azad T, Shah N, Semrau K, Berry WR, Gawande AA, Haynes AB (децембар 2015). „Relationship Between Cesarean Delivery Rate and Maternal and Neonatal Mortality”. JAMA. 314 (21): 2263—70. PMID26624825. doi:10.1001/jama.2015.15553.
„Pregnancy Labor and Birth”. Women's Health. 27. 9. 2010. Архивирано из оригинала 28. 7. 2016. г. Приступљено 31. 7. 2016. „The first stage begins with the onset of labor and ends when the cervix is fully opened. It is the longest stage of labor, usually lasting about 12 to 19 hours .. The second stage involves pushing and delivery of your baby. It usually lasts 20 minutes to two hours.”
„Pregnancy Labor and Birth”. Women's Health. 27. 9. 2010. Архивирано из оригинала 28. 7. 2016. г. Приступљено 31. 7. 2016. „The first stage begins with the onset of labor and ends when the cervix is fully opened. It is the longest stage of labor, usually lasting about 12 to 19 hours .. The second stage involves pushing and delivery of your baby. It usually lasts 20 minutes to two hours.”
„Childbirth and beyond”. womenshealth.gov (на језику: енглески). 13. 12. 2016. Приступљено 20. 11. 2018.