By School Mathematics Project
By Colin Vout, Gordon Gray
By Paul Martin, Patrick Bateson
By Brian Bolt, Bolt, Brian
By Daniel J. Velleman, Velleman, Daniel J.
By Anglesey Language Studies Centre
By R. P. Burn
By Nigel and Couper, Heather Henbest
By Clarke
By Richard Brown, Kate Ruttle, Brown, Richard, Ruttle, Kate
By Richard Brown, Brown, Richard, Large, Annabel
By Antonia Barber, Barber, Antonia
By Lawrence I Conrad, Conrad, Lawrence I
By Joanna Troughton, Troughton, Joanna
By Beryl Austoni, Penny Lucas, Austoni, Beryl, Lucas, Penny
By Aristotle
By Carolyn Collins Petersen, John C. Brandt
By Richard Brown, Kate Ruttle, Brown, Richard, Ruttle, Kate, Maland, Nick