Cohen, Louis, <br/><br/>
Research methods in education / 
Louis Cohen and Lawrence Manion. 
 - London :  Croom Helm,  1980. 
 - 328 pages :  illustrations ;  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0856649171 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational research.