Hunt, R. W. (1998). Measuring colour , 3rd edition, Fountain Press, England. ISBN 0-86343-387-1 .   . See pgs. 39-46 for the basis in human eye physiology of three-component color models, and 54-57 for chromaticity coordinates. ^ Stiles, Walter Stanley & Birch, Jennifer M. (1958). "N.P.L. colour matching investigation: final report".