Peill, E. J. <br/><br/>
Invention and discovery of reality :  the acquisition of conservation of amount / 
E. J. Peill 
 - London :  John Wiley,  c1975 
 - 203 p. ;  23 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0471677957 :  USD 18.95 
<br/><br/><label>Subjects--Personal Names: </label><br/>Piaget, Jean, 1896- <br/>Bruner, Jerome S.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of substance (Psychology)<br/>Child psychology
<br/><br/><label>Dewey Class. No.: </label>136.7