Piaget, Jean <br/><br/>
The child's conception of number 

 - London:  Routledge.  1941, 
 - Vol2. ix, 248p.:  21cm 
<br/><br/><label>ISBN: </label>0-415-16888-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child Psychology
<br/><br/><label>Dewey Class. No.: </label>155.4  / PIA