1. Sensory research in historical perspective: some philosophical foundations of perception;Jung,1984
2. The Organization of the Retina and Visual System;Kalloniatis,2013
3. The Inner Nature of Color: Studies on the Philosophy of the Four Elements;Benson,2004
4. Binocular Vision and Stereopsis;Howard,1993
5. J.L. Benson, Greek Color Theory and the Four Elements, University of Massachusetts Amherst, 2000. Available from: .