1. Roberts, G. A., Hamaker, J. C. & Johnson, A. R. (1962). Tool steels, Third ed., American Society for Metals.
2. Schroter, K. (1923). US Patent No. 1549615.
3. Ashby, M. F. & Jones, D. R. H. (1980). Engineering materials, Pergamon Press, London.
4. Almond, E. A. (1982). Towards improved tests based on fundamental properties, In: Towards improved tool performance, National Physical Laboratory Conference, Metals Society, London.
5. Becker, O. M. (1910), High-speed steel, McGraw-Hill Book Company, New York.