US National Library of Medicine. PubMed Health. Phenylketonuria. http://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0024675/. Accessed July 2016.
US Department of Health and Human Services. National Institutes of Health. Phenylketonuria (PKU) Overview. https://www.nichd.nih.gov/health/topics/pku/Pages/default.aspx. Updated August 23, 2013. Accessed July 2016.
Sanders LM. Phenylketonuria. Merck Manual. https://www.merckmanuals.com/professional/pediatrics/inherited-disorders-of-metabolism/phenylketonuria-pku. Updated January 2016. Accessed July 2016.
Bodamer OA, et al. Overview of phenylketonuria. UpToDate. http://www.uptodate.com/contents/overview-of-phenylketonuria. Updated June 2016. Accessed August 2, 2016.