Hart, H. L. A. <br/><br/>
The concept of law 
by H. L. A. Hart ; with a postcript edited by Penelope A. Bulloch and Joseph Raz. 
 - Second edition. 
 - Oxford,  Clarendon Press  1994. 
 - x, 315 p.  23 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0198760051 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Jurisprudence<br/>Law--Philosophy.
<br/><br/><label>Subjects--Index Terms: </label>Jurisprudencia. Derecho  Filosofía. 
<br/><br/><label>Dewey Class. No.: </label>340.1