1. Ashley, C. (1944) The Ashley Book of Knots, Doubleday, New York. This is an amazing book on knots from a nonmathematical point of view. Ashley collected around 3900 different kinds of knots for practical uses. “A knot is either exactly right or it is hopelessly wrong”, he wrote. “Make only one change and either an entirely different knot is made or no knot at all may result”.
2. Rolfsen, D. (1976) Knots and Links, Publish of Perish Press, Berkeley, Calif.
3. Kauffman, L. (1991) Knots on Physics, World Scientific Publ. Co., London.
4. Adams, C.C. (1994) The Knot Book, W.H. Freeman and Company, New York.
5. Skerrett, P.J. (1994) The Ties that Bind, Popular Science, May, 114–121.