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(January 22, 2007) MedlinePlus. Bilirubin (online information). Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003479.htm. Accessed April 2008.

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Wu, A. (2006). Tietz Clinical Guide to Laboratory Tests, Fourth Edition. Saunders Elsevier, St. Louis, Missouri.

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WebMD. Bilirubin. Available online at http://www.webmd.com. Accessed December 2005.