Mertler, Craig A. <br/><br/>
Introduction to educational research / 
Craig A. Mertler, C. M. Charles. 
 - 6th  ed. 
 - Boston :  Pearson,  2008. 
 - xxxiiii, 379  p. 
<br/><br/><label>ISBN: </label>0205510000 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research--Methodology.