1. The art of cutting metals;TAYLOR;Trans A.S.M.E.,1907
2. P. L. B. OXLEY, Private communication.
3. Machining data, U.S. Ordnance Corps pamphlet ORDP 40–1, pp. 234–236.
4. ZLATIN and GOULD, The Effect of a Lead Additive on the Machinability of Alloy Steels. Paper 58–SA–53, A.S.M.E.
5. Manual on the Cutting of Metals, p. 237, 1952.