1. ASTM 2006 Practice for computing the colors of objects by using the CIE System, Annual Book of ASTM Standards www.astm.org
2. ASTM 2008 Standard terminology of appearance, Annual Book of ASTM Standards www.astm.org
3. ASTM 1997 Standard practice for establishing color and gloss tolerances, Annual Book of ASTM Standards www.astm.org