1. R.M. Evans: An Introduction to Color (Wiley, New York 1948)
2. C.A. Padgham, J.E. Saunders: The Perception of Light and Colour (G. Bell, London 1975)
3. L.M. Hurvich: Color Vision (Sinauer Associates, Sunderland, Mass. 1981)
4. C.F. Bohren, A.B. Fraser: Colors of the sky. Phys. Teach. 23(5), 267–272 (1985)
5. R.M. Evans: The Perception of Color (Wiley, New York 1974)