Diyasena, W. <br/><br/>
Pre-vocational education in Sri Lanka / 
W. Diyasena. 
 - París :  UNESCO,  1976. 
 - 50 p. 
 - Experiments and innovations in education ;  28 .
<br/><br/><label>ISBN: </label>9231014048 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>373.58 (548.7) =20 DIY No. 28