"Disorders of Amino Acid Metabolism: Hereditary Metabolic Disorders." Merck & Co., Inc. Merck Manual Home Edition. Web. 08 Dec. 2010. <http://www.merckmanuals.com/home/sec23/ch282/ch282c.html>.
“Maternaal Phenylketonuria”, The American College of Obstetricians and Gynecologists, Accessed 12/9/10, http://www.AAP.org/sections/perinatal/PDF/PKU-ACOG.pdf, December 2009.
"Phenylketonuria." MayoClinic.com. Web. <http://www.mayoclinic.com/health/phenylketonuria/DS00514>.
"PHENYLKETONURIA (PKU)." Medical Information & Answers to Medical Questions - MedHelp. Web. <http://www.medhelp.org/lib/pku.htm>.
"What Is PKU?" Children's PKU Network. Web. <http://www.pkunetwork.org/PKU.html>.