Palmer,F.R. <br/><br/>
Modality and the English modals / 
Palmer,F.R. 
 - 2nd ed 
 - London:  Longman,  1990. 
 - xi,215p;26cm 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0582034868 
<br/><br/><label>Dewey Class. No.: </label>425 PAL