Nigl, Alfred J., <br/><br/>
The Development of Children's Understanding of Space Relations Among Objects : 

 -  Peter Lang Group Ag, International Academic Publishers,  1981. 
 - 94 pages 
<br/><br/><label>ISBN: </label>9783261048721 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education.
<br/><br/><label>Dewey Class. No.: </label>155.413  / NIG