Hughes, G E <br/><br/>
A New Introduction to Modal Logic 

 - London  Routledge  1996 
 - 421p 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label>0415125995     200 
<br/><br/><label>Dewey Class. No.: </label>N14  / H874