1. Anon. 1975.Identification of Textile Materials, 7th edition, 6Manchester, UK: The Textile Institute.
2. Booth, J. E. 1975.Textile Mathematics, Vol. 1, 147–148. Manchester, UK: The Textile Institute.
3. Booth, J. E. 1982.Principles of Textile Testing, 3rd edition, 359–360. London, UK: Butterworth Scientific.