Hughes, G. E.  1918-, <br/><br/>
An introduction to modal logic /G. E. Hughes [and] M. J. Cresswell. 

 - London :  Methuen,  (c)1968 (1977 printing)] 
 - x, 388 pages  22 cm. 
 - University paperbacks  431 .
<br/><br/> "Distributed in the U.S.A. by Barnes and Noble, Inc." 
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<br/><br/><label>LCCN: </label>72183219 //r86 
<br/><br/><label>Nat. Bib. No.: </label>B*** 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modality (Logic)
<br/><br/><label>LC Class. No.: </label>BC199  / .I587 1972