1. H. Leaderman, “Elastic and Creep Properties of Filamentous Materials and other High Polymers”. The Textile Foundation, Washington D.C. (1943).
2. R. Meredith, “Mechanical Properties of Textile Fibres” North-Holland Publishing Co., Amsterdam. (1956).
3. J. H. Burkhalter. Private Communication.
4. British Standard 3086 : 1959.
5. B. S. Handbook No. 11, 1956, p.179.