Handbook of evaluation research / 
ed. by Elmer L. Struening and Marcia Guttenteg 
 - Beverly Hill, E.U.A. ;  Sage,London,  1975. 
 - 2 v. 
<br/><br/><label>ISBN: </label>0803904282 
<br/><br/><label>Encabezamiento--Tema: </label><br/>INVESTIGACION EVALUATIVA