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References
1.American National Standard Practice for Industrial Lighting, A11.1-1965 (R 1970). American National Standards Institute , New York.
2.American Standard Practice for Office Lighting, A132.1-1966 , American National Standards Association , New York.
3.American Standard Guide for School Lighting, A23.1-1962 (R 1970). American National Standards Association , New York .
4.Lighting Survey Committee of the IES: “How to Make a Lighting Survey,” Ilium. Eng. , Vol. LVII , p. 87 , February, 1963 .
5.Occupational Health & Safety Letter. Vol. 2 , No. 22, November 22, 1972 , Gershon W. Fishbein, Publisher , Washington, D.C.
6.Lighting Design Practice Committee of the IES: “General Procedure for Calculating Maintained Illumination,” Ilium. Eng., Vol. 65 , p. 602 , October, 1970 .
7.Lighting Design Practice Committee of the IES: “The Determination of Illumination at a Point in Interior Spaces,” to be published.