Ary, Donald. <br/><br/>
Introduction to research in Education / 
Donald Ary 
 - 7th ed 
 - New York :  Holt, Rinehart and Winston,  2006 
 - 670 p 
<br/><br/><label>ISBN: </label>0030206065 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational research.
<br/><br/><label>LC Class. No.: </label>LB1028  / A797 I5 2006