By Buckwell, Geoff
By Alexander Zawaira (Senior Scientist, Kapa Biosystems, Cape Town, South Africa), Gavin Hitchcock (University of Zimbabwe)
By Frances McBroom Thompson (Texas Women's University)
By Lawrence W. Swienciki
By The Math Forum, Jessica Wolk-Stanley
By Steve Doyle
By Paul Dickinson, Susan Hough, Frank Eade, Steve Gough, Stella Dudzic
By Paul Andrews
By Whitcombe, Allan, etc., Wright, David
By School Mathematics Project
By Letts GCSE
By Hale, David, Pool, Peter
By Abbott, Paul, Neill, Hugh
By Senior, Trevor, Tennant, Mr Gordon
By Mason, John, Graham, Alan, Johnston-Wilder, Sue
By Doug Brown, Robin D. Howat, G. Marra, Edward C. K. Mullan, R. Murray, Ken Nisbet, J. Thomson
By Hale, Richard, Jones, Keith
By Buxton, Pam
By Maurer, Stephen B., Ralston, Anthony
By French, Doug
By Ainley, Janet, Bills, Liz, Wilson, Kirsty
By Steve Mills, Hilary Koll, Hilary Koll & Steve Mills
By Collins GCSE
By Steve Mills, Hilary Koll
By Kirkby, Dave