Hughes, G. E. (George Edward), 1918- <br/><br/>
The elements of formal logic / 
by G. E. Hughes and D. G. Londey 
 - New York :  Harper & Row,  1965 
 - xii, 403 p. :  21 cm. 
<br/><br/>Bibliography: p.386-388 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic