Color

Goethe's Theory of Colours

Johann Wolfgang von Goethe, also an audiobook

A Color Notation

A. H. Munsell, also an audiobook

Experiments and Considerations Touching Colours (1664)

Robert Boyle

Field's Chromatography

George Field

The laws of contrast of colour

M. E. Chevreul

Colour Measurement and Mixture

William de Wiveleslie Abney, Sir

Color Value

C. R. Clifford

Elementary Color

Milton Bradley

Color problems

Emily Noyes Vanderpoel

Colour as a Means of Art

Frank Howard

Aesthetische Farbenlehre

Conrad Hermann

German

Light and Colour Theories, and their relation to light and colour standardization

Joseph W. Lovibond