Introduction to research in education / 
Donald Ary ... [et al.] 
 - 7th ed. 
 - Belmont, CA :  Thomson/Wadsworth,  2006 
 - 670 p. :  ill. ;  26 cm. 
<br/><br/><label>ISBN: </label>0534555373 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research