Ross, Alf <br/><br/>
Directives and norms / 
Alf Ross 
 - ix, 188 p. ;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0710036353 
<br/><br/><label>LCCN: </label>83-672440 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Law--Philosophy