"Wendy Clemson and David Clemson" <br/><br/>
Maths puzzles 

 -  London : Dorling Kindersley, 1998.  2011 
 - 16 
<br/><br/><label>ISBN: </label>9780751356809 
<br/><br/><label>Dewey Class. No.: </label>510  / 750