Patton M.Q. <br/><br/>
Qualitative reseach &evaluation methods 
Michael Quinn Patton 
 - 3rd 
 - New delhi.:  Sage.;  2002 
 - xxi, 594p.:  ill.;  24 cm. 
<br/><br/> includes index 
<br/><br/><label>ISBN: </label>97807619711 
<br/><br/><label>LC Class. No.: </label>DUCE H62.P3218