Hughes, G. E. <br/><br/>
The elements of formal logic / 
[by] G.E. Hughes [and] D.G. Londey. 
 - London :  Methuen,  [1965] 
 - University paperbacks ;  155 .
<br/><br/>Bibliography: p. 386-388. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic.