Cohen, Louis. <br/><br/>
Research methods in education / 
Louis Cohen, Lawrence Manion and Keith Morrison. 
 - 7th ed. 
 - London :  Routledge,  2011. 
 - xvii, 758 p. :  ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9780415583367 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.<br/>Education--Research--Great Britain.