Creswell, John W. <br/><br/>
Research Design:  Qualitative, Quantitative and Mixed Methods Approaches. 

 - 4th ed 
 - Los Angeles:  Sage,  2013. 
 - xxix, 273 pg.  ill,  26 cm 
<br/><br/>Includes bibliographical references and index 
<br/><br/> Adult 
<br/><br/><label>ISBN: </label>9781452226095 
<br/><br/><label>Dewey Class. No.: </label>300.721 CRES