Logical thinking in children :  research based on Piaget's theory / 
edited by Irving E. Sigel [and] Frank H. Hooper 
 - New York :  Holt, Rinehart and Winston,  c1968 
 - xv, 541 p. :  ill. ;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label> USD 8.50 
<br/><br/><label>Subjects--Personal Names: </label><br/>Piaget, Jean, 1896- 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of substance (Psychology)<br/>Child psychology
<br/><br/><label>Dewey Class. No.: </label>136.5