Palmer, Francis Beaufort,  Sir,  1845-1917. <br/><br/>
Modality and the English modals / 
by F.R. Palmer. 
 - London :  Longman,  1979. 
 - xii, 196 p. ;  23 cm. 
 - Longman linguistics library ;  no.23 .
<br/><br/>Bibl.: p. 186-190 and Index. 
<br/><br/><label>ISBN: </label>0582551099 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Verb.<br/>English language--Modality.