Rutman, Leonard (Ed.) <br/><br/>
Evaluation Research Methods : A Basic Guide. 

 -  Sage  1977 
 - 241 P. 22 CM. 
<br/><br/> SAGE FOCUS EDITIONS ; V.3 
<br/><br/><label>ISBN: </label>803909071 
<br/><br/><label>Dewey Class. No.: </label>361.61072 EVA 1977