1. Adler, F. H., Physiology of the Eye: Clinical Application: 594 (1950).
2. Best, C. H., The Physiological Basis of Medical Practice: 1106 (1950).
3. Geldard, F. A., The Human Senses: 89 (1953).
4. Linksz, A., Physiology of the Eye 2: 226 (1952).
5. The Vertebrate Eye and its Adaptive Radiations;Cranbrook Inst. Sci. Bulletin,1942