By Pate, Katherine
By McDougal Littel
By French, Doug
By Collins A-level
By Vorderman, Carol
By Kirkby, Dave
By Abbott, Paul, Neill, Hugh
By Whitcombe, Allan, etc., Wright, David
By School Mathematics Project
By Letts GCSE
By Jordan, David
By Poskitt, Kjartan, Reeve, Philip
By Oliver, Diane
By Kirkby, Dave, Dave Kirkby
By Abbott, Paul, Wardle, Michael
By Hirst, Keith
By Buckwell, Geoff
By Graham, Christine, Christine Graham
By Hunter, John, Scottish Mathematics Group, Monk, David
By Acheson, David
By Collins GCSE
By Letts GCSE, Mapp, Fiona