Leach, James (August 1991). "3D Construction Kit". Your Sinclair. No.68. Future Publishing. p.14. Archived from the original on 24 September 2006. Retrieved 24 June 2006.
Leach, James (August 1991). "3D Construction Kit". Your Sinclair. No.68. Future Publishing. p.14. Archived from the original on 24 September 2006. Retrieved 24 June 2006.