Leedham, John <br/><br/>
Conditions of employment and status of staff in isntitutions using modern educational techniques / 
John Leedham; André Berruer. 
 - Paris :  UNESCO,  1981. 
 - 127 p. ;  lamns. 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.12/. 13 (100) =201981 LEE.