International standard classification of occupations. 

 - [2nd] revised ed. 
 - Geneva :  International Labour Organization,  1968. 
 - viii, 355 p. 
<br/><br/><label>ISBN: </label>9221000109 
<br/><br/><label>LCCN: </label>88990824  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Occupations--Classification.<br/>Occupations--Statistics.