Creswell, John W. <br/><br/>
Research design /  
John W. Creswell. 
 - 4th ed. 
 - Los Angeles :  SAGE,   2014. 
 - xxix, 273pages :  color illustration ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9781452274614 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research--Methodology.<br/>Social sciences--Statistical methods.