"Sarah Axten; [illustrated by David Dowtown]" <br/><br/>
Blue fins 

 -  Oxford : Macmillan Heinemann, 2005.  2011 
 - 16 
<br/><br/><label>ISBN: </label>9781405077897 
<br/><br/><label>Dewey Class. No.: </label>F823  / 1017