Olson, David R. <br/><br/>
Cognitive development :  the child's acquisition of diagonality / 
David R. Olson 
 - New York :  Academic Press,  1970 
 - xvii, 220 p. :  ill. ;  24 cm. 
 - 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 (Child psychology)