By Buckwell, Geoff
By Katherine Pate
By Paul Andrews
By Lawrence W. Swienciki
By The Math Forum, Jessica Wolk-Stanley
By Steve Doyle
By Graham Lawler
By Abbott, Paul, Neill, Hugh
By Whitcombe, Allan, etc., Wright, David
By School Mathematics Project
By Letts GCSE
By Hale, David, Pool, Peter
By Kirkby, Dave
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