Creswell, John W. <br/><br/>
Research design :  quantitative, qualitative and mixes methods approaches  
/ by John W. Creswell. 
 - London :  Sage ,  2009. 
 - 260 p. 
<br/><br/><label>ISBN: </label>9788132107484 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Knowledge <br/>Research <br/>Research methods <br/>Research design 
<br/><br/><label>Dewey Class. No.: </label>001.42  / CRE