Jean Piaget and Barbel Inheldr <br/><br/>
The Child's construction of quantities 

 - Routledge & Kegan Paul, London  1974 
 - viii,285p 
<br/><br/><label>ISBN: </label>0-7100-7887-0 
<br/><br/><label>Dewey Class. No.: </label>136.72 Pia/Inh