George's secret key to the universe 
Lucy Hawking; S W Hawking; Christophe Galfard; Garry Parsons 
 - London  [publisher not identified]  2007 
 - 295 p. : ill 
<br/><br/><label>ISBN: </label>9780385612708 
<br/><br/><label>Dewey Class. No.: </label>823.08762 HAW