Placenta previa. American Pregnancy Association website. Available at:
http://americanpregnancy.org/pregnancycomplications/placentaprevia.html. Updated May 2007. Accessed August 6, 2013.
Placenta previa. EBSCO DynaMed website. Available at:
http://www.ebscohost.com/dynamed. Updated October 15, 2012. Accessed August 6, 2013.
Pregnancy complications. US Office on Women's Health website. Available at:
http://www.womenshealth.gov/pregnancy/you-are-pregnant/pregnancy-complications.html. Updated September 27, 2010. Accessed August 6, 2013.
5/12/2014 DynaMed's Systematic Literature Surveillance http://www.ebscohost.com/dynamed: Podrasky AE, Javitt MC, et al. American College of Radiology (ACR) Appropriateness Criteria for second and third trimester bleeding. Available at: http://www.acr.org/~/media/ACR/Documents/AppCriteria/Diagnostic/SecondAndThirdTrimesterBleeding.pdf. Updated 2013. Accessed May 12, 2014.
American Congress of Obstetricians and Gynecologists
FamilyDoctor.org - American Academy of Family Physicians
Women's Health Matters