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

 - [2a ed.] 
 - London :  Oxford University Press,  1972. 
 - 263 p. 
 - Clarendon law .
<br/><br/> p. 257-258. Notas al pie de página.  Donación del Dr. Enrique Petracchi. Index. 
<br/><br/>Persistent questions. Laws, commands, and orders. The variety of laws. Sovereign and subject. Law as the union of primary and secondary rules. The foundations of a legal system. Formalism and rule-scepticism. Justice and morality. Laws and morals. International law. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LEYES