Readings in educational psychology 
/ ed. by Henry Clay Lindgren, ... 
. - New York  : John Wiley & Sons, c1968
. - X-474 p.  : ill., couv. ill. en coul.  ; 23 cm. 
<br/><br/>Index 
<br/><br/><label>Source: </label> Don UCL 
<br/><br/><label>Universal Decimal Class. No.: </label>159.9