Creswell, John W. <br/><br/>
Research design  qualitative, quantitative and mixed methods approaches 

 - Los Angeles  sage  2009 
 - xxix, 260p. 
<br/><br/><label>ISBN: </label>9788132107484 
<br/><br/><label>Subjects--Index Terms: </label>Research methodology Research design Quantitative methods 
<br/><br/><label>Universal Decimal Class. No.: </label>001.8  / CRE