Guba, Egon G Lincoln, Yvonna S <br/><br/>
Fourth generation evaluation 

 - Newbury park  Sage publications, inc.  1989 
 - 294 p.; 22cm. 
<br/><br/><label>ISBN: </label>803932359 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Evaluation techniques