Piaget, Jean,  1896-1980. <br/><br/>
The child's conception of number / 
Jean Piaget. 
 - New York :  W.W. Norton & Co.,  1965. 
 - ix, 248 p. ;  23 cm. 
 - The Norton Library  N324 .
<br/><br/>Includes bibliogr. references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number concept in children.<br/>Cognition in children
<br/><br/><label>Dewey Class. No.: </label>155.4/1323