Nagy, József. <br/><br/>
The Hungarian experience of OOK: an instrument for the development of educational technology / 
József Nagy. -- 
 - Paris :  Ginebra :  UNESCO;  OIE,  1980. 
 - 101, (1) p. ;  il., map. -- 
 - Experiments and innovations in education ;  43. .
<br/><br/><label>ISBN: </label>9231018728 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.68 (439.1) =20 NAG No.43.