Copi, Irving M. <br/><br/>
Readings on logic / 
Irving M. Copi, James A. Gould. 
 - 2nd ed. 
 - New York :  Macmillan,  1972. 
 - 317 p. ;  24 cm. 
<br/><br/>p. 302-310 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic--Collected works.