By Haworth, Ms Elizabeth
By Galligan, Mr Frank, Maskery, Mr Colin, Crawford, Ms Dee
By McDuell, Mr Bob
By Burton, George, Holman, John, Pilling, Gwen, Waddington, David
By York Science Education Group, The University of
By Tracy Traynor
By Gale, MR Peter
By Murray, Robin, Filer, Denis
By Marland, Michael, etc.
By Bolt, Brian
By School Mathematics Project
By Ratcliff, Brian