1. Venkataraman K. The chemistry of synthetic dyes, vol. 3, New York and London: Academic Press, 1970. p. 249–301[chapter VI].
2. Lewis DM. Wool dyeing. Leeds; Society of Dyes and Colourists, 1992. p. 283–95.
3. Bayer, German patent 2724079, 1978.
4. Burkinshaw SM. Chemical principles of synthetic fibre dyeing, London: Blackie Academic and Professional, 1995.
5. Reife A, Freeman HS. Environmental chemistry of dyes and pigments. New York: John Willey and Sons, 1996.