Cohen, Louis,  1928- <br/><br/>
Research methods in education / 
L. Cohen and L. Manion. 
 - 3-rd ed. 
 - London ;  New York, NY :  Routledge,  1989. 
 - xxii, 413 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographical references (p. 382-400) and index. 
<br/><br/><label>ISBN: </label>0415044103 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.<br/>Education--Research--Great Britain.