Warttig S, Ward S, Rogers G, Guideline Development Group National Institute for Health and Care Excellence. Diagnosis and management of gallstone disease: summary of NICE guidance.BMJ. 2014;349:g6241. PMID 25360037. Retrieved April 2015.
Gore, R., MD and Levine M. (2015) Textbook of Gastrointestinal Radiology Fourth Edition. Saunders. Retrieved April 2015 from https://www.clinicalkey.com/#!/content/book/3-s2.0-B9781455751174000775?scrollTo=%23s0020
Chaudhary V, Bano S. Nutritional considerations in modern radiology. (6-May-2014) J Med Nutr Nutraceut;3:57-9. Retrieved April 2015 from: http://www.jmnn.org/text.asp?2014/3/2/57/131953.