Copi, Irving M. <br/><br/>
Symbolic logic / 
Irving M. Copi. 
 - 5th ed. 
 - Quezon City :  JMC Press,  c1979. 
 - xiii, 398 p. 
<br/><br/> Includes appendices and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical