Piaget, Jean,  1896- <br/><br/>
The child's conception of number / 
translated by C. Gattegno and F. M. Hodgson 
 - London :  Routledge & K. Paul,  1952 
 - ix, 248 p. ;  22 cm. 
 - International library of psychology, philosophy and scientific method .
<br/><br/> Translation of La genese du nombre chez l'enfant 
<br/><br/><label>LCCN: </label>52-004983 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child psychology<br/>Number concept