Productive work and the partial self-funding of schools / 
Roselyn R. Gillespie... (et al.) 
 - Paris :  UNESCO,  1987. 
 - 186 p 
 - Reports and studies on educational policy and planning ;  s.134 .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.386. 8 (100)=20 1987PRO No.134.