Palmer, F. R. <br/><br/>
Modality and the English modals / 
F. R. Palmer. 
 - London :  Longman,  1979. 
 - xi, 196 p. 
 - Longman linguistics library .
<br/><br/><label>ISBN: </label>0582551099 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Verb.<br/>English language--Modality.