Guba,, Egon G.  c1981. <br/><br/>
Effective Evaluation/ 
Egon G. Guba and Yvonna S. Lincoln. 
 - London:  Josse.Bass,  c1981. 
 - xix, 417.:  23cm. 
<br/><br/> Includes index and bibliographic refrences. 
<br/><br/><label>ISBN: </label>0875894933 
<br/><br/><label>LC Class. No.: </label>AZ 191  /  .G8 1981