Hart, H.L.A. <br/><br/>
The concept of law. 

 - 3rd ed. 
 - New Delhi :  Oxford University Press,  2017 
 - lv, 333 p. ; 
<br/><br/><label>ISBN: </label>9780198729990 
<br/><br/><label>Dewey Class. No.: </label>340 HAR