Keil, Franck C. <br/><br/>
Semantic and conceptual development:  an ontological perspective / 
by Franck C. Keil 
 - London :  Harvard University Press,  1979. 
<br/><br/><label>ISBN: </label>0674801008 
<br/><br/><label>Subjects--Index Terms: </label>Child Psychology Congnition