Relevant methods in comparative education :  report of a meeting of international experts / 
Edited by Reginald Edwards; Brian Halmes; John Van de Graaff. 
 - Hamburg :  UNESCO;  Institute for Education,  1973. 
 - 270 p. 
 - International Studies in Education ;  33 .
<br/><br/><label>ISBN: </label>9282010031 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>37.015 (100) =20 REL