Encyclopedia of educational research :  a project of the American educational research association / 
Robert L. Ebel, editor; Victor H. Noll, associate editor; Roger M. Bauer, editorial assistant 
 - 4th ed. 
 - London :  MacMillan,  1969 
 - 1522 p. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Dictionaries<br/>Education--Bibliography