Encyclopedia of educational research  

 - 4th ed.  
 - London:   The Macmillan Company Collier-Macmillan Limited,   1969 
 - xxviii, 1522p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education 
<br/><br/><label>Subjects--Index Terms: </label>Bibliographic sources  
<br/><br/><label>Universal Decimal Class. No.: </label>R 37.001.5(03)   / K9