1. Pigment Handbook (1973) 1st edition, ed. by T.C. Patton, Vols I-III, John Wiley and Sons, New York; (1988) 2nd edition, ed. by P.A. Lewis, John Wiley and Sons, New York.
2. Christie, R.M. (1993) Pigments: Structures and Synthetic Procedures, Oil and Colour Chemists Association, London.
3. Kaul, B.L. (1993) ‘Coloration of Plastics using Organic Pigments’, Rev. Prog. Coloration, 23, 19.
4. Christie, R.M. (1994) ‘Pigments, Dyes and Fluorescent Brightening Agents for Plastics: an Overview’, Polymer International, 34, 351.
5. Herbst, W. and Hunger, K. (1993) Industrial Organic Pigments, VCH Verlagsgesellschaft, Weinheim.