Weilenmann.Alexander. <br/><br/>
Evaluation reseach and social change. 

 - ed. 
 - belgium :  unesco,  1980. 
 - 104  p. ;    cm. 
<br/><br/>references. 
<br/><br/><label>ISBN: </label> $ 
<br/><br/><label>Subjects--Topical Terms: </label><br/>social change.