1. F. Habashi, “Karl Josef Bayer (1847–1904). A Pioneer in Hydrometallurgy and Pressure Technology”, Progress in Extractive Metallurgy 1, 1–16 (1973).
2. F. Habashi, “Hydrometallurgy. Its Past, Present, and Future”, Trans. Indian Inst. Metals 31 (4), 231–238, 279 (1978).
3. J.W. Mellor, A Comprehensive Treatise of Inorganic and Theoretical Chemistry, Volume 5, pp. 253–263, Longmans, London, 1929.
4. J.D. Edwards, F.C. Frary, and Z. Jeffries, The Aluminum Industry. McGraw Hill, N.W York, 1930.
5. see also N.C. Craig and C.M. Bickert, “Hall and Hérault: the Men and Their Invention”, Bull. Can. Inst. Min. & Met. 79 (892), 98–101 (1986).