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Bentor,Yinon.Tungsten.1996-1997.http://domains.twave.net/domain/yinon/w.html(20 October 1998).

Emsley, John. The Elements. Tungsten's Abundances. Oxford University Press Inc., New York. 1991.

Heiserman, David. Exploring Chemical Elements and their Compounds. History of Tungsten. Division of McGraw-Hill, Inc. 1992. 

Hsu, D. David. "Chemicool." Division of Chemical Education, Inc. 1996-97 http://www-tech.mit.edu/Chemicool/elements/tungsten.html(25 October 1998).

Lide,R. David; Frederikse, H.P.R.  "HandBook Of Chemistry and Physics." Naturally Occurring Isotopes, Tungsten. CRC Press, Inc. 1994.

Prof. Dr. Menzel. "The Periodic table of Element." Tungsten. Ernst Klett Schulbuchverlag GmbH & Co. KG, Stuttgart. 1983.

Winter, Mark. Tungsten (W).University of Sheffield, England. 1993-1998. http://www.shef.ac.uk/~chem/web-elements/W/key.html (19 October 1998).

"Processing mining and concentrating." Tungsten. Encyclopedia Britannica, Inc.1994-98. http://search.eb.com/bol/search?type=topic&query=Tungsten&DBase=Articles (10 February 1998).