Introduction to Logic / 
Copi Irving ; Carl Cohen  
 - 10th ed. 
 - New Jersey :  Prentice hall ,  1998. 
 - xx,714 p,: 
<br/><br/><label>ISBN: </label>0132425874 
<br/><br/><label>LC Class. No.: </label>BC108  / .C66  1998