1. International Union of Pure and Applied Chemistry (IUPAC), Clinical Chemistry Division, Commission on Toxicology, Glossary for chemists of terms used in toxicology, Pure Appl. Chem. 65 (1993) 2003–2122.
2. International Programme on Chemical Safety (IPCS), Biomarkers and Risk Assessment: Concepts and Principles, Environmental Health Criteria 155, WHO, Geneva, 1993.
3. Validity criteria for the use of biological markers of exposure to chemical agents in environmental epidemiology
4. World Health Organization (WHO), Air Quality Guidelines for Europe, WHO Regional Office for Europe, Copenhagen, 1987, pp. 242–261.
5. International Agency for Research on Cancer (IARC), IARC Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans, vol. 29, IARC, Lyon, 1982, p. 93.