Piaget Jean. <br/><br/>
The child's conception of physical causality / 
by Jean Piaget. 
 - ed. 
 - New Jersey :  Littlefield,  c1969. 
 - 309 p. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child psychology.
<br/><br/><label>LC Class. No.: </label>BF721  / .P43