HUGHES, G.E. <br/><br/>
An Introduction to modal logic / 
[by] G.E.Hughes, M.J.Cresswell 
 - London  Methuen  1972 
 - xi, 388 p. 
<br/><br/> Includes bibliography and index. 
<br/><br/><label>ISBN: </label>41629460X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic<br/> Modality-Logic
<br/><br/><label>Dewey Class. No.: </label>160  / HUG