International bureau of education in the service of educational development 
Unesco 
 - Paris, France  United Nations Educational, Scientific and Cultural Organization  1979 
 - 152p. 
<br/><br/><label>ISBN: </label>92-3-101733-0 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education