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

 - 2nd. 
 - Thousand Oaks, California :  Sage Publications,  2003. 
 - xxvi, 246p. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0761924426 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research methods.