Copi, Irving M. <br/><br/>
Introduction to logic / 
Irving M. Copi. 
 - 6th ed. 
 - New York :  MacMillan,  1982. 
 - 604 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>002324920X 
<br/><br/><label>LCCN: </label>81-5991 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic.