Apuzzio, Joseph J.; Vintzileos, Anthony M.; Berghella, Vincenzo; Alvarez-Perez, Jesus R. (2017). Operative Obstetrics, 4E (بالإنجليزية). CRC Press. p. PT822. ISBN:9781498720588. Archived from the original on 2020-10-30.
Apuzzio, Joseph J.; Vintzileos, Anthony M.; Berghella, Vincenzo; Alvarez-Perez, Jesus R. (2017). Operative Obstetrics, 4E (بالإنجليزية). CRC Press. p. PT822. ISBN:9781498720588. Archived from the original on 2020-10-30.