By CGP Books
By D. Rayner, Rayner, D.
By School Mathematics Project
By Williams, Margaret, etc., Timms, Diana
By Gordon, Keith, Speed, Brian, Senior, Trevor, Evans, Kevin
By Nicholson, Su, Timmins, Russell, Byrd, Greg
By Allan, Ray, Williams, Martin T.
By Ann Montague-Smith
By Santaniello, Joe
By Mark Patmore, Patmore, Mark
By Edwards, Roy, Mary, Ward, Alan
By Griffiths, Rose