Gelman, Rochel <br/><br/>
The child's understanding of number 

 - Cambridge:  Harvard university press,  1978. 
 - xiii,260p.;  24cm 
<br/><br/><label>ISBN: </label>0-674-11636-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Primary Education
<br/><br/><label>Dewey Class. No.: </label>372.7  / GEL