International recommendations on labour statistics 
/ [publ. by international labour organization] 
. - Génève  : BIT, 1981
. - vii-131 p.  ; 24 cm. 
<br/><br/><label>ISBN: </label>9221013766 
<br/><br/><label>Source: </label> achat 
<br/><br/><label>Universal Decimal Class. No.: </label>311.