Encyclopedia of educational research . Vol. I 

 - 5th Ed.; 
 - London :  The free press,  1941. 
 - Vol. i, xxiii,518p.;  29cm 
<br/><br/><label>ISBN: </label>0029004500 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education<br/>Encylopedia
<br/><br/><label>Dewey Class. No.: </label>370.7803  / ENC