Statistical yearbook = annuaire statistique = annuario estadistico 
/ UNESCO 
. - Paris  : Unesco, 1982
. - Pagination multiple  ; 28 cm. 
<br/><br/><label>ISBN: </label>9230020621 
<br/><br/><label>Source: </label> Don de la Banque mondiale 
<br/><br/><label>Universal Decimal Class. No.: </label>311.