Encyclopedia of educational research :  a project of the American educational research association / 
edited by Robert L. Ebel, Victor H. Noll and Roger M. Bauer. 
 - 4th ed. 
 - London :  Macmillan,  c 1960. 
 - 1522 p. ;  29 cm. 
<br/><br/>333  333 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia--Educational research.
<br/><br/><label>Dewey Class. No.: </label>370.78 / E19