ACOG Practice Bulletin: Early pregnancy loss. Number 150, May 2015.
ACOG Practice Bulletin: Cerclage for the management of cervical insufficiency. Number 142, February 2014.
Cunningham F, Leveno K, Bloom S, et al. Williams Obstetrics, 22nd ed. The McGraw Hill Companies, Inc. 2008.
Gibbs R, Karlan B, Haney A, Nygaard I. Danforth’s Obstetrics and Gynecology. 9th ed. Lippincott Williams and Wilkins. 2008.
Lentz G, Lobo RA, Gershenson D, Katz VL. Comprehensive Gynecology. 6th ed. Mosby Elsevier, 2013.
Riley LE, Stark AR, et al, Eds. Guidelines for Perinatal Care. 7th ed. 2012. American Academy of Pediatrics. The American College of Obstetrics and Gynecologists.
Toulandi T, Al-Fozan HM, et al. Spontaneous abortion: Risk factors, etiology, clinical manifestations, and diagnostic evaluation. UpToDate. http://www.uptodate.com/contents/spontaneous-abortion-risk-factors-etiology-clinical-manifestations-and-diagnostic-evaluation?source=search_result&search=Spontaneous+abortion%3A+Risk+factors%2C+etiology%2C+clinical+manifestations%2C+and+diagnostic+evalu&selectedTitle=1%7E150. Updated August 25, 2016. Accessed September 2016.