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American College of Obstetricians and, Gynecologists. ACOG Practice Bulletin No.142: Cerclage for the management of cervical insufficiency.. Obstetrics and gynecology. Feb 2014, 123 (2 Pt 1): 372–9. PMID 24451674. doi:10.1097/01.AOG.0000443276.68274.cc.
Macdonald, R; Smith, P; Vyas, S. Cervical incompetence: the use of transvaginal sonography to provide an objective diagnosis.. Ultrasound in Obstetrics & Gynecology. Sep 2001, 18 (3): 211–6. PMID 11555448. doi:10.1046/j.1469-0705.2001.00459.x.
Armarnik, S; Sheiner, E; Piura, B; Meirovitz, M; Zlotnik, A; Levy, A. Obstetric outcome following cervical conization.. Archives of gynecology and obstetrics. April 2011, 283 (4): 765–9. PMID 21327802. doi:10.1007/s00404-011-1848-3.
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Abdel-Aleem, H; Shaaban, OM; Abdel-Aleem, MA. Cervical pessary for preventing preterm birth.. The Cochrane database of systematic reviews. May 31, 2013, 5: CD007873. PMID 23728668. doi:10.1002/14651858.CD007873.pub3.