By Winocour, Peter H., Marshall, Sally M.
By Littlejohn, Andrew
By Ellis
By Malcolm Barber
By Davies, P. C. W.
By School Mathematics Project
By Sternberg PhD, Robert J.
By Cronin, Helena, Smith, John Maynard
By R. P. Burn
By Matthews, P. H.
By Nigel and Couper, Heather Henbest
By Michael Gopfert, Jeni Webster, M.V. Seeman
By Simpson, WILLIAM
By Field, Ron
By Lock, Graham
By Jones, Mary, Jones, Geoff, Acaster, David
By Jones, Mary, Jones, Geoff
By Jones, Geoff, Jones, Mary, Marchington, Phillip
By Snape, Charles, Scott, Heather
By Levy, David H.
By Brimblecombe, Peter