APA (7th ed.) Citation

Wright, W. D. (1967). The rays are not coloured: Essays on the science of vision and colour. Hilger.

Chicago Style (17th ed.) Citation

Wright, William D. The Rays Are Not Coloured: Essays on the Science of Vision and Colour. London: Hilger, 1967.

MLA (9th ed.) Citation

Wright, William D. The Rays Are Not Coloured: Essays on the Science of Vision and Colour. Hilger, 1967.