Colour : three lectures given in Dornach 6 to 8 May 1921 with nine supplemntary lectures given on various occassions /
Steiner, Rudolf,1861-1925.
Slater, John.
Wehrle, Pauline.
London : Rudolph Steiner Press,
1996.
"The first three lectures were previously published as Colour in 1982"
Originally published in German as "Das wesen der farben" (Vol. 291 in the Rudolf Steiner Gesamtausgabe or collected works)