Plaget, Jean <br/><br/>
The child's Conception of Number / 
Jean Plaget,  
 - 3rd ed. 
 - London :  Routledge & Kegan Paul Ltd,  1965. 
 - 248 p. :  21 cm. 
<br/><br/>includes Index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number Concept in Children<br/>Number Concept<br/>Child Psychology
<br/><br/><label>Dewey Class. No.: </label>155.41323  / PLA 1965