By Caleb Gattegno
By Carol Vorderman
By Egmont Uk
By Cotton, Tony
By Anthony Thomson, Lucian Camp
By Listed No Author
By Mark Patmore, Patmore, Mark
By Richard Cooper, Shirley Armer, Cooper, Richard, Armer, Shirley, Riley, Mark Burville
By Jean Holderness, Holderness, Jean
By Theoni Pappas
By Patrick Suppes
By The Mathematical Association
By Andrew Jeffrey
By David E. Hanson, Hanson, David E.
By Henry Pluckrose, Chris Fairclough, Pluckrose, Henry, Fairclough, Chris
By S. Llewellyn, Alex Greer, Llewellyn, S., Greer, Alex
By Ewart Smith
By Liz Ransford
By OU Course Team