Bray, Mark. <br/><br/>
School clusters in the third world :  making them work / 
Mark Bray 
 - Paris :  UNESCO  UNICEF,  1987. 
 - 147 p. ;  il., map. 
 - Child, Family, Community ;  23. .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.6 (-77) =20 BRA No.23.