Year book of labour statistics =  Annuaire des statistiques du travail = Anuario de estadâisticas del trabajo 
International Labour Office.  
 - 49th issue. 
 - Geneva  International Labour Office  1990.  
 - 1094 p.  31 cm. 
<br/><br/> At head of title: 1989-90.  
<br/><br/><label>ISBN: </label>922006426X 9789220064269 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Working class--Statistics.