By Brian Bolt
By Martin Gardner, Sean Shesgreen
By Greg N. Frederickson (Purdue University, Indiana)
By Angela Fox Dunn
By Charles Seife
By Collins KS2
By Maker, Brainstorm
By Casti, John
By Marcus Du Sautoy
By Deslandes, Clement, Guillaume
By Rooney, Anne
By The Times Mind Games, .
By The Times Mind Games
By Gardner, Martin
By Mullins, Roy
By Jenkins, Adrian
By Bee, WILLIAM
By Vorderman, Carol
By Rob Eastaway, John Haigh
By Allenby, R. B. J. T.
By Dudeney, H.E.
By Weinstein, Lawrence, Adam, John A.
By Sautoy, Marcus du, Marcus Du Sautoy
By The UK Mathematics Trust
By Claire Publications
By Mazur, Joseph