BBC: Move over Segway, I'm planning the C6 - Article about Sir Clive Sinclair, announces secret plans for another pioneering new personal transporter. - http://news.bbc.co.uk/1/hi/magazine/3125341.stm
Sinclair C5 Enthusiasts - Includes concept drawings, extensive technical information, links, and other materials. - http://www.sinclairc5.com/
Sinclair User 36 - Sinclair C5 - A feature on the Sinclair C5 from Sinclair User, March 1985 - http://www.sincuser.f9.co.uk/036/sincc5.htm
Planet Sinclair: C5 - Information and articles. - http://www.nvg.ntnu.no/sinclair/vehicles/c5.htm