Creswell,John W. <br/>
Educational Research :  Planning,Conducting and Evaluating Quantitative and Qualitative Research / 

 - 4th ed 
 - Boston :  Pearson,  c2012. 
 - xxii, 650 p. :  24 cm.  
<br/><br/><label>ISBN: </label>978-0-13-136739-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics
<br/><br/><label>Dewey Class. No.: </label>370.72 CRE