By Collins GCSE
By D.J. Heath
By Stephen Doyle, Tony Holloway
By Paul Hoffman
By Christopher J. Cox, D. Bell
By Stephen Doyle
By W E Williams & S Y Barham
By Serena Alexander
By Philip Patrick Thorns, Janice Marion King
By Michael J.de Smith
By Kent County Council
By Christopher Jones, Peter Clamp
By Harry Smith
By James J. Callahan, Jr.
By Thomas A. Garrity (Williams College, Massachusetts), Lori Pedersen
By Philip Kitcher
By Barry Cooper
By School Mathematics Project
By Janet Rees, Rees, Janet
By Fentem, Roger, Berry, John, Langham, Sue
By John Bird (Defence College of Technical Training, UK)
By Sue Atkinson, Liz Atkinson
By Joseph Schmuller
By Elinor Jones, Simon Harden, Michael J. Crawley (Imperial College of Science, Technology and Medicine, UK)
By Siobhan Roberts
By P. G. Drazin (University of Bristol)