1. American Medical Association. Primary care for persons with disabilities: access to assistive technology. Guidelines for the use of assistive technology: evaluation, referral, prescription. Available at: http://www.ama-assn.org/ama1/pub/upload/mm/433/assistivetechnology.pdf. Accessed November 15, 2006.
2. The polio stela. Catalog References: ǼGYPTEN II, 1998, Kat 34; Inventory Number ǼIN 134. Ny Carlsberg Glypotek Museum. Available at: http://www.glyptoteket.dk. Accessed November 15, 2006.
3. Centers for Medicare and Medicaid Services. New efforts aim at stopping abuse of the power wheelchair benefit in the Medicare program. September 9, 2003. Available at: http://oig.hhs.gov/publications/docs/press/2003/090903release.pdf. Accessed November 15, 2006.
4. When walking fails;Iezzoni,2003
5. Physical activity and health: a report of the Surgeon General,1996