1. Belman, S. 1981. Proceedings of a workshop conference on the role of metals in carcinogenesis. Envir. H. Per. 40: 1–252.
2. Bradford-Hill, A. 1977. A Short Text Book of Medical Statistics. London: Hodder and Stoughton.
3. Fachetti, S., and Griff, F. 1982. Isotopic Lead Experiment: Status Report. Brussels: CEC.
4. Freshwater Institute. 1983. Mercury Quality Assurance Program. Winnipeg, Canada: Dept. of Fisheries and Oceans.
5. Friberg, L.; Nordberg, G.F.; and Vouk, V.B., eds. 1979. Handbook on the Toxicology of Metals. Amsterdam: Elsevier.