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2. Minerals Yearbook (1950–84), U.S. Bureau of Mines, Washington, D.C.
3. Watson, W.D., in The Biogeochemistry of Mercury in the Environment, ed. Nriagu, J.O. Elsevier, Amsterdam (1979), Chapter 3.
4. Andren, A.W. and Nriagu, J.O., in The Biogeochemistry of Mercury in the Environment, ed. Nriagu, J.O. Elsevier, Amsterdam (1979), Chapter 1.
5. Greenwood, M.R. and Von Burg, R., in Metalle der Umwelt, ed. E. Merian, Verlag Chemie, Weinheim (1984), Chapter II, 18.