World book encyclopedia  
/ Field Enterprises Educational Corporation, volume 12, L 
 - Chicago:   Field Enterprises Educational Corporation,   1964 
 - 468p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia 
<br/><br/><label>Subjects--Index Terms: </label>Education  
<br/><br/><label>Universal Decimal Class. No.: </label>R 030.1   / K4.12