Walberg, Herbert J <br/><br/>
Effective educational practices / 
Herbert J. Walberg; Susan J. Paik. 
 - Geneva :  Belgium :  IBE;  International Academy of Education,  2000. 
 - 23 p. 
 - Educational practices series ;  3. .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.3 =20 "2000" WAL No.3.