1. Tungsten News, ed. by Kurt H. Miska, Volume 21, Numbers 1, 2, and 3, 1983. ISSN 0049-481X.
2. Bulletin Number 16, November 1983, published by the Primary Tungsten Association, London, England. ISSN 0264-8652.
3. Tungsten in 1983, Mineral Industry Surveys, U.S. Department of the Interior, Bureau of Mines, Washington, D.C.
4. C.K. Yun et al., “Characterization of a Tungsten Refinery Based on Solvent Extraction,” American Institute of Chemical Engineers, New York, Presented at the American Institute of Chemical Engineers National Meetings, Denver, Colorado, August 28–31, 1983.
5. V.S. Sastri, “Determination of Tungsten in Complex Sulphide Ore Concentrates,” Talanta, 29(5) (1982), pp. 405–406.