Penrose, Roger <br/><br/>
Shadows of the mind : 

 - London :  Vintage Books,  © 1994 
 - xiv, 457 pages :  illustrations ;  19 cm. 
<br/><br/> Includes index 
<br/><br/>Includes bibliographical references 
<br/><br/><label>ISBN: </label>9780099582113 
<br/><br/><label>Dewey Class. No.: </label>006.3   / PEN