"Ruth Merttens and David  Kirkby" <br/><br/>
Abacus Evolve 5 Text book 1 

 - London  Heinemann Educational Publishers  2007 
 - 80 
<br/><br/><label>ISBN: </label>9780602575793 
<br/><br/><label>Dewey Class. No.: </label>510  / 2259