Deregowski, Jan B. <br/><br/>
The horizontal-vertical illusion and the ecological hypothesis. 

 - [Lusaka] :  University of Zambia, Human Development Research Unit,  1967. 
 - Zambia. University. Human Development Research Unit report ;  no. 4 .
 - University of Zambia. Human Development Research Unit report ;  University of Zambia. Human Development Research Unit report ;  no. 4 .
<br/><br/>Bibliography: p. [7]. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Optical illusions.