Portner, Paul. <br/><br/>
Modality 
 Oxford linguistics 
Paul Portner 
 - Oxford   Oxford University Press  2009 
 - x, 288 p.  ill  26 cm 
 - Oxford surveys in semantics and pragmatics .
<br/><br/> Includes bibliographical references (p. [267]-283) and index 
<br/><br/><label>ISBN: </label>9780199292431 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modality (Linguistics)<br/>Modality (Logic)