Copi, Irving M <br/><br/>
Symbolic logic 

 - 5 
 - New Delhi  Prentice - Hall  1979 
 - 398p 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>81-203-0970-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic -- Symbolic<br/>Mathematical logic<br/>Symbolic logic