- Wood, Debra. "Down Syndrome: DS; Trisomy 21." Consumer Health Complete. N.p., n.d. Web.
- "Doctor Tipster." Doctor Tipster. N.p., n.d. Web. 04 Nov. 2015.
- Buchstein, Fred, and Sharon Stark. "Turner Syndrome." N.p., n.d. Web.
- Matzen, Grace. "Klinefelter Syndrome." N.p., n.d. Web.
- "Poonchengmoh." : GENETIC DISEASES. N.p., n.d. Web. 04 Nov. 2015.
- Powars, Darleen. "Sickle Cell Disease." N.p., n.d. Web.
- "Tay-Sachs Disease." EBSCO Host, n.d. Web.
- "2. Tay-Sachs Disease." HCMS-Genetic-Disorder-Research -. N.p., n.d. Web. 04 Nov. 2015.
- Karcher, Susan. "Huntington's Disease." N.p., n.d. Web.
- Alan, Rick. "Huntington's Disease: Huntington Chorea; HD." N.p., n.d. Web.
- Carson-DeWitt, Rosalyn. "Cystic Fibrosis: CF." N.p., n.d. Web.
- "Cystic Fibrosis." Funk & Wagnalls New World Encyclopedia, n.d. Web.
- Alan, Rick. "Albinism: Hypopigmentation; Oculocutaneous Albinism; Ocular Albinism." N.p., n.d. Web.
- Cheney, Richard. "Albinism." N.p., n.d. Web.
- "Epigenetics Sheds New Light on Altruism | Genetic Literacy Project."Genetic Literacy Project. N.p., 10 Sept. 2013. Web. 04 Nov. 2015.