1. Stoichita, V.I. (1997) A Short History of the Shadow, Reaktion Books
2. Baxandall, M. (1995) Shadows and Enlightenment, Yale University Press
3. Geometry of shadows;Knill;J. Opt. Soc. Am. A.,1997
4. da Vinci, L. (1970) The Notebooks of Leonardo da Vinci (Vol. 1), Dover
5. Horn, B.K. and Brooks, M.J. (1989) Shape from Shading, MIT Press