1. Lewis, D. M. In Wool Dyeing, Ed. D. M. Lewis. Society of Dyers and Colourists, Bradford, 1992, pp 225–227.
2. Maclaren, J. A. and Milligan, B., Wool Science: The Chemical Reactivity of the Wool Fibre. Science Press, Marrickville, Australia, 1981, pp 5–16, 165–178.
3. Lewis, D. M., Melliand Textilber, 1986, 67 717.
4. Mäusezahl, D., Textilveredlung, 1970, 5, 839.
5. Ball, P., Meyer, U. and Zollinger, H., Text Research Journal, 1986, 56, 447.