Bray, Mark <br/><br/>
Multiple-shift schooling :  desing and operation for cost-effectiveness / 
MarkBray. 
 - Paris :  Nueva York :  UNESCO;  UNICEF,  1989. 
 - 99 p. ;  il. 
 - Child family community ;  27. .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371 =20 BRA