Patton Michael Quinn <br/><br/>
Qualitative evaluation and research methods 

 - 2 
 - Newbury Park   Sage Publications  1990 
 - 532p. 
<br/><br/><br/>MACESE 
<br/><br/><label>ISBN: </label>0-13-794553-1 
<br/><br/><label>Source: </label>Textual