Hart,H.L.A <br/><br/>
The Concept of Law 

 - ed.2 
 - Oxford  Oxford Univesity Press  1961 
 - xii,315p. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>978-0-19-566417-1 
<br/><br/><label>Dewey Class. No.: </label>340 HAR.1'61