By Anthony Eccles, Alan Graham. And Roger Porkess, Eccles, Anthony, Graham, Alan
By Gadd, Ken
By Magnus J. Wenninger
By Cerfolli, Fulvio, Chinery, Michael
By McDuell, Booth, Dawson, Honeysett, Byron, etc.
By Jones, Lesley
By Buckwell, Geoff
By Ross, Prof. Alistair
By Adam Hart-Davis, Hart-Davis, Adam
By School Mathematics Project
By Tortora, Gerard J., Funke, Berdell R., Case, Christine L.
By Harry Browne
By Moseley, Cherri
By Evans, Kevin, Gordon, Keith, Courcy, Jayne de
By Cox, C. J., Bell, D.
By Banks, Mr Tony, Alcorn
By Senior, Trevor, Fisher, Tony, Procter-Green, Shaun, Burns, Sandra
By Clarke, Peter
By Steve Mills, Hilary Koll, Mills, Steve, Koll, Hilary
By Mills, Steve, Koll, Hilary
By Unknown
By Bryon, Mike
By CGP Books
By Various
By Dabell, John
By McDaniel, Yvette
By Exam Ninja, Joshua Geake, Dasi Downes
By Lieberthal, Edwin M.
By Scarry, Richard, No Author.