Piaget, Jean, <br/><br/>
The child's conception of number. 
[Translated by C. Gattegno and F. M. Hodgson] 
 - London  Routledge & Paul  [1964] 
 - ix, 248 p.  22 cm. 
<br/><br/><label>LCCN: </label>52004983 //r882 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child psychology<br/>Number concept.
<br/><br/><label>LC Class. No.: </label>BF723.N8  / P53 
<br/><br/><label>Dewey Class. No.: </label>136.745101