Creswell, John W., <br/><br/>
Research design :  qualitative, quantitative, and mixed methods approaches / 
John W. Creswell, J. David Creswell 
 - Sixth Edition 
 - xxvii, 291 pages :  illustrations ;  25 cm. 
<br/><br/>Include index and bibliographical reference 
<br/><br/><label>ISBN: </label>9781071870631 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research<br/>Qualitative research<br/>Quantitative research<br/>Mixed methods research