1. Dyes and Their Intermediates;Abrahart,1968
2. Color Chemistry, Verlag Helvetica Chimica Acta;Zollinger,2003
3. Code of Federal Regulations, Title 21, Part 74.1304, US Government Printing Office, Washington, DC, 2007.
4. Code of Federal Regulations, Title 21, Parts 70.3(e) and 80, US Government Printing Office, Washington, DC, 2007.
5. The Analytical Chemistry of Synthetic Dyes;Leatherman,1977