"Surgery-General." - Medical Specialties. N.p., n.d. Web. 05 Feb. 2014.
"Result Filters." National Center for Biotechnology Information. U.S. National Library of Medicine, n.d. Web. 27 May 2014. .
"Result Filters." National Center for Biotechnology Information. U.S. National Library of Medicine, n.d. Web. 16 May 2014
U.S National Library of Medicine. U.S. National Library of Medicine, 16 May 2012. Web. 15 Jan. 2014. http://www.nlm.nih.gov/medlineplus/ency/article/001655.htm 2.) "Lesch-Nyhan Syndrome."
Web. 15 May 2014. "Duchenne Muscular Dystrophy: MedlinePlus Medical Encyclopedia." U.S National Library of Medicine. U.S. National Library of Medicine.
National Center for Biotechnology Information. U.S. National Library of Medicine, 23 Sept. 2005. Web. 27 Apr. 2014.
4. What Is DNA. Genetics Home Reference, n.d. Web. 15 Feb. 2014.
MedicineNet. Ed. Melissa Stöppler, MD. WebMD, 9 Jan. 2014. Web.
“What Is Williams Syndrome.” Williams Syndrome. Williams Syndrome Association, n.d. Web. 11 Feb. 2014. . “Williams Syndrome.” Genetics Home Reference.