Routledge <br/><br/>
Piaget 
/by Routledge 
 - Paris:  Kegan Pul;  1947. 
 - xi,202p. 
<br/><br/><label>ISBN: </label>978-0-367-67864-7 
<br/><br/><label>Dewey Class. No.: </label>153.9  / ROU/P