References
- Kaufman JE editor. 1966. IES Lighting Handbook. 4th ed. New York (NY): Illuminating Engineering Society.
- Kaufman JE editor. 1981. IES Lighting Handbook. Reference Volume. New York (NY): Illuminating Engineering Society.
- Rea MS editor. 2000. IESNA Lighting Handbook. 9th ed. New York (NY): Illuminating Engineering Society of North America.
- Levin R, Brackett W., Burke J, Frank N. 2002. Field study of luminaire dirt depreciation. J. Illum. Eng. Soc. 31 (2): 26–37.