Lemke, Donald A. <br/><br/>
From a "teaching" curriculum to a "learning" curriculum / 
Donald A. Lemke 
 - Santiago de Chile :  UNESCO;  OREALC,  1980. 
 - 19 p. 
 - notes comments... ;  50. .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.3 (7/8) =20 LEM No. 50