^ 3.03.13.2Palacios-Jaraquemada, JM. Caesarean section in cases of placenta praevia and accreta.. Best practice & research. Clinical obstetrics & gynaecology. April 2013, 27 (2): 221–32. PMID 23127895. doi:10.1016/j.bpobgyn.2012.10.003.
^ 4.04.14.24.3Allahdin, S; Voigt, S; Htwe, TT. Management of placenta praevia and accreta.. Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology. 2011, 31 (1): 1–6. PMID 21280984. doi:10.3109/01443615.2010.532248.
^ 5.05.15.2Cresswell, JA; Ronsmans, C; Calvert, C; Filippi, V. Prevalence of placenta praevia by world region: a systematic review and meta-analysis.. Tropical medicine & international health : TM & IH. June 2013, 18 (6): 712–24. PMID 23551357. doi:10.1111/tmi.12100.
^Callander, Kevin P. Hanretty ; illustrated by Ian Ramsden, Robin. Obstetrics illustrated 6th ed., Reprinted. Edinburgh [etc.]: Churchill Livingstone. 2004: 187. ISBN 0-443-07267-1.
^Fan, Dazhi; Wu, Song; Liu, Li; Xia, Qing; Wang, Wen; Guo, Xiaoling; Liu, Zhengping. Prevalence of antepartum hemorrhage in women with placenta previa: a systematic review and meta-analysis. Scientific Reports. 9 January 2017, 7: 40320. doi:10.1038/srep40320.
^Dashe, JS; McIntire, DD; Ramus, RM; Santos-Ramos, R; Twickler, DM. Persistence of placenta previa according to gestational age at ultrasound detection.. Obstetrics and gynecology. May 2002, 99 (5 Pt 1): 692–7. PMID 11978274. doi:10.1016/s0029-7844(02)01935-x.
^Jr, [edited by] E. Albert Reece, John C. Hobbins ; foreword by Norm F. Gant,. Clinical obstetrics : the fetus and mother. 3. Malden, MA: Blackwell Pub. 2006: 1050. ISBN 978-1-4051-3216-9.
^Bhide, Amar; Thilaganathan, Basky. Recent advances in the management of placenta previa. Current Opinion in Obstetrics and Gynecology. 2004, 16 (6): 447–51. PMID 15534438. doi:10.1097/00001703-200412000-00002.
^Oppenheimer, LW; Farine, D; Ritchie, JW; Lewinsky, RM; Telford, J; Fairbanks, LA. What is a low-lying placenta?. American Journal of Obstetrics and Gynecology. October 1991, 165 (4 Pt 1): 1036–8. PMID 1951509. doi:10.1016/0002-9378(91)90465-4.
^Neale, E. J.; Rogers, M. S. Vaginal ultrasound for ruling out placenta previa. Case report. BJOG: an International Journal of Obstetrics and Gynaecology. 1 July 1989, 96 (7): 881–881. doi:10.1111/j.1471-0528.1989.tb03334.x.
^Smith, RS; Lauria, MR; Comstock, CH; Treadwell, MC; Kirk, JS; Lee, W; Bottoms, SF. Transvaginal ultrasonography for all placentas that appear to be low-lying or over the internal cervical os.. Ultrasound in Obstetrics & Gynecology. January 1997, 9 (1): 22–4. PMID 9060125. doi:10.1046/j.1469-0705.1997.09010022.x.