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

 - 7th ed 
 - Routledge, New York  2011 
 - xxii,758 
<br/><br/><label>ISBN: </label>978-0-415-58336-7 
<br/><br/><label>Dewey Class. No.: </label>370.78 Coh