BBC: Move over Segway, I'm planning the C6: Article about Sir Clive Sinclair, announces secret plans for another pioneering new personal transporter.
Planet Sinclair: C5: Information and articles.
Sinclair C5 Enthusiasts: Includes concept drawings, extensive technical information, links, and other materials.
Sinclair User 36 - Sinclair C5: A feature on the Sinclair C5 from Sinclair User, March 1985