1. K. Lange (Ed.): Handbook of Metal Forming (McGraw-Hill, New York 1985)
2. K. Lange (Ed.): Umformtechnik, Band 1: Grundlagen, 2nd edn. (Springer, Berlin 1984), in German
3. W.D. Callister Jr.: Materials Science and Engineering (Wiley, New York 1990)
4. ICFG: ICFG Document No. 11/01: Steels for Cold Forging (Meisenbach, Bamberg 2001)
5. R. Hill: The Mathematical Theory of Plasticity (Oxford Univ. Press, Oxford 1950)