1. Metal Bulletin Monthly, April and September 1982.
2. American Metal Market News, December 17, 1982.
3. Richard D. Burlingame, AIME Meeting, Chicago, January 1983.
4. Heinz H. Parizer, Ferroalloy Statistics, 1975–1980.
5. World Stainless Steel Statistics, INCO Europe Ltd., 1981.