Indigestion. (2013). Medline Plus, U.S. National Library of Medicine and National Institute of Health. Retrieved 10/20/14 from http://www.nlm.nih.gov/medlineplus/ency/article/003260.htm.
National Digestive Diseases Information Clearinghouse. Indigestion. US Dept of Health and Human Services, National Institute of Diabetes and Digestive and Kidney Diseases. NIH Pub. 09-4549. 11/2008. Accessed 10/2011 from http://digestive.niddk.nih.gov/ddiseases/pubs/indigestion/.