Jean Piaget <br/><br/>
The Child's Conception of Number 

 - 4th edition 
 - London  Routledge & Kegan Paul LTD  1969 
 - 248p  22cm 
<br/><br/> Translated by French by C. Gattegno.<br/>Original name: La Genèse du Nombre chez l'enfant. 
<br/><br/><label>ISBN: </label>710031424 
<br/><br/><label>Dewey Class. No.: </label>155.413 P589cn