Olson, David R., <br/><br/>
Cognitive development;  the child's acquisition of diagonality 
[by] David R. Olson. 
 - New York,  Academic Press,  1970. 
 - xvi, 220 p.  illus. 
 - The Child psychology series .
<br/><br/>Bibliography: p. 204-209. 
<br/><br/><label>ISBN: </label>0125256507 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cognition in children.
<br/><br/><label>Dewey Class. No.: </label>155.41  / OLS.C