Chopra, Ravi  <br/><br/>
Reasoning n reasoning /  
Ravi Chopra 
 - New Delhi :  Galgotia Publications  2006. 
 - 522 p. 
<br/><br/><label>ISBN: </label>817515523X 
<br/><br/><label>Dewey Class. No.: </label>658  / RAV