Langer, Jonas. <br/><br/>
The origins of logic :  six to twelve months / 
Jonas Langer. 
 - New York :  Academic Press,  1980. 
 - xiii, 437 p. :  ill. ;  24 cm. 
 - Developmental psychology series .
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 433-434. 
<br/><br/><label>ISBN: </label>0124361501 
<br/><br/><label>LCCN: </label>79023266  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cognition in infants.<br/>Logic.<br/>Infant psychology.
<br/><br/><label>LC Class. No.: </label>BF723.C5  / L364 
<br/><br/><label>Dewey Class. No.: </label>160