Piaget, Jean,  1896- <br/><br/>
The child's conception of number / 
by Jean Piaget 
 - New York :  Norton ;  1965 
 - ix, 248 p. ;  20 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0393003248 
<br/><br/><label>LCCN: </label>82-197854 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child psychology<br/>Number concept