Wolfram, Sybil. <br/><br/>
Philosophical logic :  an introduction/ 
Sybil Wolfram. 
 - London, New York:  Routledge,  1989. 
 - xiv, 290p. 
<br/><br/>includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0415023181 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Philosophical Logic
<br/><br/><label>LC Class. No.: </label>BC71