By Bell, David E.
By Robert Layton
By Wes Magee
By Roy Edwards, Mary Edwards, Alan Ward
By Judith Baxter, Baxter, Judith
By Colin Goldsmith, David Nelson, School Mathematics Project
By Brian Bolt, Bolt, Brian
By Jeffrey Wood, Lynn Wood
By Rob Childs
By Paula Bartley, Cathy Loxton
By Hewett, Barbara
By Alan Millard
By Mike Savage, Julian Williams
By New Horizons Science
By Helen Cook, Morag Styles, Michael Charlton
By Helen Cook, Morag Styles, Cook, Helen, Styles, Morag
By Glendinning, Eric H., Holmstrvm, Beverly
By Ray Stevens
By STEP 5-16 Design and Technology
By School Mathematics Project
By Susan Golombok, Golombok, Susan
By Alan R. Townsend
By William D. Lutz
By University of Cambridge Local Examinations Syndicate
By Ford Boris
By Victor Bryant