1. William R. Freeman, “Investment Casting”, Superalloys II, ed. Chester T. Sims, Norman S. Stoloff and William C. Hagel, (John Wiley and Sons, Inc. 1987), 411 439
2. “Symposium on Materials for Gas Turbines”, Forty-Ninth Annual Meeting , ASTM, 1946
3. Chester T. Sims, “A History of Superalloy Metallurgy for Superalloy Metallurgists”, Superalloys 1984 , ed. M. Gell et al., (TMS 1984), 399 419
4. Kenneth Harris, private communication with the author, March 2010
5. Robert W. Hatala and John J. Schirra, “Developement of a Damage Tolerant Heat Treatment for Cast + HIP Incoloy 939”, Superalloys1996 , ed. R.D. Kissinger et al. (TMS, 1996), 137 143