Ary , Donald  <br/><br/>
Introduction for research in education/ 
Donald Ary [ and two others] 
 - Sixth edition 
 - California, USA:   Wadsworth Group,  c2002. 
 - xxvi, 582 pages:  illustrations;  25cm. 
<br/><br/>Includes appendix, glossry, and index. 
<br/><br/><label>ISBN: </label>0-534-24665-6 
<br/><br/><label>Dewey Class. No.: </label>Circ. 370.7 A796i 2002