By Alison Wilcox (School writer and researcher, UK)
By Barber, Nick
By Mapp, Fiona C., Fiona
By Gill Budgell, Kate Ruttle
By Mark Patmore, Eddie Wilde, Jean Matthews, Howard Baxter, John Jeskins
By Adam Cash
By Yvonne Gostling, Bob Hartman, Howard Johnson, Jean Matthews, Michael Handbury
By Catherine Baker, Angeles Peinador, Collins Big Cat
By Paul Humphreys
By Sheila Innes (Newport Free Grammar School, Essex)
By Foster, John, Simon, Richardson, Kim
By Collins Easy Learning
By Unidentified Author, School Mathematics Project
By Evans, Kevin, Gordon, Keith, Senior, Trevor, Speed, Brian, Kevin Evans, Keith Gordon, Trevor Senior, Brian Speed
By Howard Baxter et. al, Mike Handbury, John Jeskins, Jean Matthews, Howard Baxter, Eddie Wilde
By Webber, B., Barnes, T.
By Ceri Shahrokhshahi
By Gordon, Keith
By Anne Schreiber, National Geographic Kids
By Alexandra Zapruder, National Geographic Kids
By Catherine Berry, Sophie Goldie, Brandon Wilshaw, Leonie Turner, Margaret Bland
By Jane A Medwell, David Wray, Hilary Minns, Vivienne Griffiths, Elizabeth Coates
By University of Cambridge Local Examinations Syndicate
By Hawys Morgan, Ludovic Salle, Collins Big Cat
By Susan B. Neuman, National Geographic Kids
By Teresa Heapy, Jan Smith, Collins Big Cat