Patton, Michael Quinn. <br/><br/>
Qualitative evaluation and research methods/ 
by Michael Quinn Patton. 
 - 2nd.- 
 - Newbury Park:  Sage Publications,  c1990. 
 - 532p.:  ill.; 
<br/><br/> includes references  
<br/><br/><label>ISBN: </label>9780803937796 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Evaluation research (Social action programs)
<br/><br/><label>Dewey Class. No.: </label>300.723