1. GAO (United States Government Accountability Office) Report to the Chairman, Committee on Environment and Public Works, U.S. Senate, Chemical Assessments, Low Productivity and New Interagency Review Process Limit the Usefulness and Credibility of EPA's Integrated Risk Information System 2008 http://www.gao.gov/new.items/d08440.pdf
2. U.S. EPA (United States Environmental Protection Agency) A Review of the Reference Dose and Reference Concentration Process 2002
3. NAS (National Academy of Sciences) National Academy of Sciences. Risk Assessment in the Federal Government: Managing the Process 1983
4. U.S. EPA (United States Environmental Protection Agency) Integrated Risk Information System, 2010 http://www.epa.gov/IRIS/