1. “The Cushion-Socket Below-Knee Prosthesis”;Burgess;Clin Orthop Relat Res,2010
2. NLLIC Staff. “Amputation Statistics by Cause Limb Loss in the United States” (2008) NLLIC
3. Amputee Statistical Database for the United Kingdom: 2004/05 Report
4. http://www.khelnama.com/130217/athletics/news/%E2%80%98blade-runner%E2%80%99-pistorius-showed-narcissist-tendencies-say-experts dated: 11/01/2014
5. http://pofsea.org/local-prosthetic-and-orthotic-component-development/knee-joint/ dated: 11/01/2014