Heaney, Francis <br/><br/>
The Sudoku code: 200 Sudoku puzzles. one answer. can you find It? 
Francis Heaney, Frank Longo 
 - New Delhi  Sterling Publishing  2006 
 - 221 p 
<br/><br/><label>ISBN: </label>9781402740091 
<br/><br/><label>Dewey Class. No.: </label>793.74 HEA