Maternal serum alpha-fetoprotein screening (MSAFP). American Pregnancy Association. http://americanpregnancy.org/prenatal-testing/maternal-serum-alpha-fetoprotein-screening/. Accessed July 2016.
ACOG Practice Bulletin: Screening for Fetal Aneuploidy, Number 163, May 2016. Replaces Number 77, January 2007.
Cunningham F, et al. Williams Obstetrics. 24th ed. The McGraw Hill Companies, Inc. 2014.
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.
ACOG Practice Bulletin: Prenatal Diagnostic Testing for Genetic Disorders, Number 162, May 2016.