Illusion :  in nature and art / 
edited by R. L. Gregory and E. H. Gombrich 
 - London :  Duckworth,  1973 
 - 288 p. :  ill. ;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0715607558 :  PND 7.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Optical illusions<br/>Visual perception
<br/><br/><label>Dewey Class. No.: </label>152.73