CDU - Clasificacion Decimal Universal :  edicion abreviada espanola 

 - 3. ed. rev. atual 
 - 324 p. 
 - FID publication ; n.517 .
<br/><br/><label>ISBN: </label>84-600-6525-1 
<br/><br/><label>Subjects--Corporate Names: </label><br/>International Federation for Information and Documentation
<br/><br/><label>Universal Decimal Class. No.: </label>025.45CDU  / F449c