Zakrajsek, Secro <br/><br/>
The Integration of the elements with high motivating value: a chance for school system in a time of crisis / 
Secro Zakrajsek. 
 - Yugoslavia :  The Board of Education,  1990. 
 - 4 p. 
 - ED-90/CPA.401/DP.4/12 .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>37.014.5 :37.012 (497.1) =20 ZAK.