Hawking, Stephen  <br/><br/>
George and the unbreakable code  

 -  Random House Children`s Publishers   2011 
 - 313p. 
<br/><br/><label>ISBN: </label>9780552570053 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English fiction; Adventure stories; Children`s stories <br/>English literature 
<br/><br/><label>Dewey Class. No.: </label>823  / H313g