Copi, Irving M., <br/><br/>
Introduction to Logic 
Irving M. Copi, Carl Cohen 
 - 11th ed. 
 - New Delhi :  Pearson Education,  c2002. 
 - xxi, 647 p.:  ill.; 
<br/><br/><label>ISBN: </label>8178089661 
<br/><br/><label>Dewey Class. No.: </label>160  / COP/INT