Gelman, Rochel. <br/><br/>
The child's understanding of number / 
Rochel Gelman and C. R. Gallistel. 
 - Cambridge, Mass. :  Harvard University Press,  1978. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0674116364 
<br/><br/><label>LCCN: </label>78005124 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number concept.
<br/><br/><label>LC Class. No.: </label>QA141.15  / .G44 
<br/><br/><label>Dewey Class. No.: </label>372.7/2/044