1. Adidas Undated. Product webpage for adidas miCoach system http://www.adidas.com/uk/micoach/
2. Apple, Inc Undated. Product webpage for Nike + iPod system http://www.apple.com/ipod/nike/
3. Astrin A. 2011 https://mentor.ieee.org/802.15/documents?is_group=0006
4. Bluetooth Special Interest Group (SIG) 2010 https://www.bluetooth.org/Technical/Specifications/adopted.htm
5. Department of Health 2007 http://www.dh.gov.uk/en/Publicationsandstatistics/Publications/PublicationsPolicyAndGuidance/DH_074448