Gabriel, Richard A. <br/><br/>
Program evaluation :  a social science approach / 
by Richard A. Gabriel. 
 - New York :  MSS Information Corporation,  1975. 
 - 297 p. ;  23 cm. 
<br/><br/><label>ISBN: </label>0842252266 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Evaluation research (Social action programs).