References
- BlackwellH. R., “Development and Use of a Quantitative Method for Specification of Interior Illumination Levels on the Basis of Performance Data”, Illuminating Engineering, Vol. LIV, P. 317, June 1959.
- PowellLen, Communication and Learning, New York: American Elsevier Publishing Co., Inc., 1969. P. 22.
- La GiusaFrank and PerneyLawrence, “Effects of Brightness Variations on Attention Span in a Learning Environment”, Lighting Design and Application, Vol. 3, No. 5 May 1973, pp. 28 and 29.