Experiments in visual perception / 
Edited by M. D. Vernon 
 - 2nd ed. 
 - Harmondsworth :  Penguin,  1970 
 - 472 p. :  ill. ;  18 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0140805028 
<br/><br/><label>LCCN: </label>72-500945 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Visual perception--Addresses, essays, lectures