By Tibballs, Geoff
By Newby, Peter
By Langford, David
By Bailie, J.M.
By Prefontaine, M
By Parkinson, Judy
By Moscovich, Ivan
By Deslandes, Clement, Guillaume
By NO AUTHOR
By The guardian
By Vaughan, Johnny, Outen, Denise van
By Moore, Dr Gareth
By Smullyan, Raymond M.
By You, Have I Got News For
By Tulloch, Alexander
By Barry R. Clarke, illustrated by Rob Collinet
By Kampelmann
By Arcturus Publishing
By Schott, Ben
By Bradford, Anne R., Collins Puzzles
By Wyse, Elizabeth, Anon
By The UK Mathematics Trust
By The Times Mind Games
By The Times Mind Games, .
By Lange, Catherine De
By Ayto, John
By Adrian Fisher