1. ASTM D1535, Standard Practice for Specifying Color by the Munsell System, West Conshohoken PA, ASTM International.
2. ASTM D2244, Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates – ibid.
3. ASTM D4086, Standard Practice for Visual Evaluation of Metamerism – ibid.
4. ASTM E284, Standard Terminology of Appearance – ibid.
5. ASTM E308, Standard Practice for Computing the Colors of Objects by Using the CIE System – ibid.