1. R.G. Harry, The hair, in: J.B. Wilkinson, R.J. Moore (Eds.), Harry's Cosmeticology, Longman, London, 1987, pp. 395–419.
2. J.A Maclaren, B. Milligan, Wool Science, The Chemical Reactivity of the Wool Fibre, Science Press, Marrickville, NSW, Australia, 1981.
3. A. Datyner (Ed.), Surfactant Science Series, vol.14, Surfactants in Textile Processing, Dekker, New York, 1983.
4. R.D.B. Fraser, T.P. McRae, G.E. Rogers, Keratins, their Composition, Structure and Biosynthesis, Charles C. Thomas, Springfield, IL, 1972.
5. C.R. Robbins, Chemical and Physical Behavior of Human Hair, Van Nostrand Reinhold, New York, 1979, pp. 1–17.