Struening Elmer L Ed. <br/><br/>
Handbook of evaluation research.2V. 

 - London  SAGE Publications           1975 
<br/><br/><label>Standard No.: </label>138527 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>Sigma:f, L5.1.-2