Colour /
Steiner, Rudolf,1861-1925.
Sussex : Rudolf Steiner Press,
c1992.
"Three lectures given in Dornach, 6th to the 8th of May, 1921 together with nine supplementary lectures given on various occasions."
The first three lectures were previously available separately as: Colour. Rudolf Steiner Press, 1982.
Translation of: Das Wesen der Farben.