1. Torsten Ericsson, Principal of Heat treating of Steels,, ASM Handbook Vol.4, 1991, p.14 – 25.
2. Classification and Designation of Carbon and Low Alloy Steel,, ASM Handbook Vol.1, 1990, p.387.
3. Alok Nayar, The Steel Handbook,, Tata McGraw–Hill Publishing company Ltd., New Delhi, pp.24-32.
4. Forming and Forging,, ASM Metals Handbook, Vol.14, ASM International, 1993, pp.66-75.
5. Banaszek G, Dyja H, Berski S and Janik Theoretical and experimental analysis of the effect of die shape on the internal quality of forged rods,, Journal of Material Processing Technology, 2004, pp.571-577.