1. T.E. Furia (Ed.), CRC Handbook of Food Additives, 2nd Edition, Vol. I, CRC Press, Boca Raton, FL, 1981.
2. R. Macrae, R.K. Robinson, M.J. Sadler (Eds.), Encyclopaedia of Food Science, Food Technology and Nutrition, Vol. II, Academic Press, San Diego, CA, 1993.
3. Colouring our foods in the last and next millennium
4. Directiva 94/36 del Parlamento Europeo y del Consejo, de 30 de junio, Diario Oficial de las Comunidades Europeas, No. L237, 1994, p. 13.
5. Code of Federal Regulations Title 21, US Government Printing Office, Washington, DC, 1 April 2001 (revised), Parts 70–82.