By Gillian Ravenscroft
By Jenny Alexander, Christine Hall, Martin Coles
By Nimenko Gloria Parkes, Keith Howard, Alan Baker, Rebecca Ferguson
By Collins Kids
By Harlen, Wynne
By Farrow, Steve
By Wilkes, Angela
By Andrew C. Revkin
By Joanna Cole, Bruce Degen
By School Mathematics Project
By Louie Stowell, John Devolle
By Gill Arbuthnott (Author)
By Mary Jones, Richard Fosbery, Jennifer Gregory, Dennis Taylor
By Roberts, M. B. V., Ingram, N.R., Michael, Neil, M. B. V. Roberts, N.R. Ingram
By Mackean, D. G., D. G. Mackean
By Chris Park (Lancaster University)
By B. J. Knapp
By Louise Spilsbury
By Jonathan Melmoth, Rosie Dickins, Louie Stowell, Shaw Nielsen
By Dr. Carol Ballard
By Gray, Leon
By Christine Moorcroft
By Riley, Peter, Petheram, Louise, Glover, David, Mitchell, Ian
By CGP Books
By Sam French
By Clarke, David
By Matt Anniss
By BBC