
Kandinsky, Wassily. Concerning the Spiritual in Art. Página 25. Dover Fine Art, History of Art. Edición ilustrada, integra, reimpresa, revisada. Courier Corporation, 1977. ISBN 9780486234113. 57 páginas. https://books.google.es/books?id=mG-VRWgfpuYC&pg=PR23&dq=9780486234113&hl=es&sa=X&ved=0ahUKEwiU_tK25fPhAhVHUBoKHTSpAAUQ6AEIKDAA#v=snippet&q=colour%20is%20a%20power%20which%20directly%20influences%20the%20soul..%20Colour%20is%20the%20keyboatd%2C&f=false