Deregowski, Jan B. <br/><br/>
Difficulties in pictorial perception in Africa /  
Jan B. Deregowsk i. 
 - Lusaka :    Human Development Research Unit,    1966. 
 - 38 p. :    ill. 
 - H. D. R. U. reports;    1 .
<br/><br/><label>Subjects--Topical Terms: </label><br/> Picture-writing -- Africa<br/> Picture interpretation tests<br/> Perception -- testing