References:
1- Engineering Plasticity. By W. Johnson and P. B. Mellor
2- Metal Forming Mechanics and Metallurgy by W. F. Hosford and R.M. Caddell
3- Mechanics of Sheet Metal Forming by Z. Marciniak, J.L. Duncan, and S.J. Hu
4- Metal Forming Handbook, Springer-Verlag Berlin Heidelberg.