Perkins, Michael R. <br/><br/>
Modal expressions in English / 
Michael R. Perkins. 
 - London :  Frances Pinter,  1983. 
 - x, 186 p. ;  23 cm. 
 - Open linguistics series .
<br/><br/><label>ISBN: </label>0861872983 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Modality<br/>English language--Semantics.