Cohen, Louis; Manion, Lawrence & Morrison, Keith <br/><br/>
Research methods in education 

 - 6th ed 
 - Routledge, New York  2010 
 - xviii, 638 
<br/><br/><label>ISBN: </label>978-0-415-36878-0 
<br/><br/><label>Dewey Class. No.: </label>370.78 Coh