Hart, H.L.A. <br/><br/>
The Concept of law. 
H.L.A. Hart 
 - London:  Oxford University Press;  1961. 
 - viii, 263 p. 
<br/><br/>Includes bibliography and index. 
<br/><br/><label>ISBN: </label>0-19-876072-8 
<br/><br/><label>Dewey Class. No.: </label>340 HAC