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2. Hall, G., and Bobrick, M.: Improved illumination of the dental treatment room. USAF School of Aerospace Medicine, Brooks Air Force Base, Texas, December 1968.
3. Illuminating Engineering Research Institute; Effective seeing in an era of energy conservation. Cited from a continuing education course, School of Engineering, University of Wisconsin Extension, Madison, Wisconsin: Designing the color, light, and visual environment for human performance. Sept. 1975.
4. Ott, J.: Health and Light, New York, New York Pocket Books, A Division of Simon and Schuster, November, 1976.