By School Mathematics Project
By Lawler, Dr. Graham, Dr. Graham Lawler
By Broadbent, Paul, Broadbent, Anne, Paul Broadbent, Anne Broadbent
By BBC
By Lawlor, Graham
By Various
By Naomi Norman
By Graham Lawlor, Rob Kearsley Bullen
By Kearsley Bullen, Rob
By Foulsham Books
By Cotton, David
By Mathematics Centre
By David Cotton
By Simmons, Malcolm
By Speed, Brian
By Shell Centre Joint Matriculation Board of Mathematics
By Fleet, Tony
By Paul Latham, Percy Truelove