Bray, Mark <br/><br/>
Double-Shift schooling :  Design and operation for cost-efectiveness/ 
Mark Bray. 
 - Paris :  London :  Commonwealth Secretariat,  UNESCO;  2000. 
 - il. 
<br/><br/><label>ISBN: </label>0850926505 (Commonwealth Secretariat) 9280312006 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.2 =20 "2000" BRA.