APA (7th ed.) Citation

Abney, W. d. W. (2012). Colour Measurement and Mixture. Project Gutenberg.

Chicago Style (17th ed.) Citation

Abney, W. de W. Colour Measurement and Mixture. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Abney, W. de W. Colour Measurement and Mixture. Project Gutenberg, 2012.

Warning: These citations may not always be 100% accurate.