1. Principles and Methods of Sheet Metal Fabricating;Sachs,1951
2. Mechanics of sheet metal bending;Schroeder;Trans ASME,1943
3. The springback of metals;Gardiner;Trans ASME,1948
4. Mechanics of sheet bending process;Shaffer;Trans ASME,1960
5. Aspects of draw die forming of sheet metal;Duncan,1977