Educational research in classrooms and schools :  a manual of materials and methods / 
Louis Cohen (ed.). 
 - London :  Harper & Row,  c1976. 
 - xvi, 426 p. 
<br/><br/><label>ISBN: </label>0063180472 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.