1. Michael JW: Modern prosthetic knee mechanisms. Clin Orthop Relat Res. 1999, 361: 39-47.
2. World Health Organisation: International Classification of Functioning, Disability and Health: ICF. 2001, Geneva: World Health Organisation
3. Centers for Medicare and Medicaid Services. U.S. Department of Health and Human Services: HCFA Common Procedure Coding System (HCPCS). 2001, Springfield (VA): U.S. Department of Commerce, National Technical Information Service
4. Protocol verstrekkingsproces beenprothesen (Protocol for Prescribing Leg Prostheses). http://www.orthopeden.org/uploads/cn/y3/cny3JZduoBe68eJzUy8KJA/Protocolverstrekkingsprocesbeenprothesen1november2010.pdf ,
5. van Tulder M, Furlan A, Bombardier C, Bouter L: Updated method guidelines for systematic reviews in the cochrane collaboration back review group. Spine (Phila Pa 1976). 2003, 28 (12): 1290-1299.