Cohen, Louis. <br/><br/>
Research methods in education / 
Louis Cohen, Lawrence Manion and Keith Morrison. 
 - 6th ed. 
 - London :  Routledge,  2007. 
 - xviii, 638 p. :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9780415368780 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.<br/>Education--Research--Great Britain.