1. Mauersberger, H. R. 1947.‘Matthews’ Textile Fibers’, 5th edition, 566New York: Wiley.
2. Von Bergen, W. 1963.“Wool Handbook, Vol. 1, 3rd edition, 219New York: Interscience.
3. Bowman, F. H. 1908.The Structure of the Wool Fibre’, 2nd edition, 261London: Macmillan.
4. Scale substance of wool
5. Minerals In Domestic Wools