Andrew B., MD Peitzman; Andrew B. Peitzman; Michael, MD Sabom; Donald M., MD Yearly; Timothy C., MD Fabian. The Trauma Manual. Hagerstwon, MD: Lippincott Williams & Wilkins. 2002: 3. ISBN 0-7817-2641-7.
American College of Surgeons. Consultation/Verification Program, Reference Guide of Suggested Classification. American College of Surgeons. 2006: 3. ISBN 0-7817-2641-7.