Bohren, C. F., and A. B. Fraser, 1985: Colors of the sky. The Physics Teacher, 23, 267-272 (May).

Lynch, D. K., 1995: Color and Light in Nature. Cambridge, 277 pp.

Meinel, A. B., and M. Meinel, 1983: Sunsets, Twilights, and Evening Skies. Cambridge, 173 pp.

Minnaert, M., 1954: The Nature of Light and Colour in the Open Air. Dover, 362 pp. [An updated (1995) version, with color photographs, is Light and Color in the Outdoors. Springer, 424 pp].

Naylor, J., 2002: Out of the Blue. Cambridge, 372 pp.

