Popkorn, Sally <br/><br/>
First steps in modal logic 
Sally Popkorn 
 - Cambridge  Cambridge University Press  1994 
 - xiii, 314 p. : ill. ; 24 cm 
<br/><br/> Includes bibliographical references (p. 311-314) 
<br/><br/><label>ISBN: </label>9780521057936 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modality (Logic)
<br/><br/><label>Dewey Class. No.: </label>511.3 POP