Alchin, Nicholas <br/><br/>
Theory of knowledge:  for the IB diploma/ 
by Nicholas Alchin and Carolyn P. Henly  
 - 3rd edition  
 - London  Hodder Education   2014 
 - viii,472p.:  Col. ill. 
<br/><br/> Includes index  
<br/><br/><label>ISBN: </label>9781471804151 
<br/><br/><label>Dewey Class. No.: </label>121