Gelman, Rochel <br/><br/>
The child's understanding of number / 
Rochel Gelman and C. R. Gallistel 
 - Cambridge, Mass. :  Harvard University Press,  1978 
 - xiii, 260 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0674116364 :  USD13.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number concept
<br/><br/><label>Dewey Class. No.: </label>372.7