Universal Decimal Classification :  UDC 331: labour 

 - 4. ed 
 - 22 p. 
 - FID Publication ; n.179)British Standards ; 1000331): 1971 .
<br/><br/><label>ISBN: </label>0-580-06742-4 
<br/><br/><label>Subjects--Corporate Names: </label><br/>International Federation for Information and Documentation
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trabalho
<br/><br/><label>Universal Decimal Class. No.: </label>025.45CDU  / F449u