Universal decimal classification 
International Federation for Documentation 
 - 3rd rev. ed. 
 - London  British Standards Institution  1961 
 - 254p. 
 - B.S. 1000A: 1961 .
<br/><br/><label>Subjects--Topical Terms: </label><br/> Classification<br/>Book Classification <br/>Classification, Decimal 
<br/><br/><label>Universal Decimal Class. No.: </label>25.45  / UDC