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

 - 5th 
 - New Delhi  Prentice-Hall of India  1996 
 - xiii,398p p. 
<br/><br/><label>ISBN: </label>81-203-0970-7 
<br/><br/><label>Subjects--Index Terms: </label>Logic, Symbolic and mathematical