Patton, Michael Quinn. <br/><br/>
Qualitative Research and Evaluation Methods :  integrating theory and practice/ 
Michael Quinn Patton. 
 - 4th ed. 
 - Los Angeles :  Sage Publications,  2015. 
 - xxi, 806p :  ill. ;  28 cm. 
<br/><br/> Includes Index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9781412972123 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research Methods.