1. MERAG: Metals environmental risk assessment guidance; 978-0-9553591-2-5;International Council of Mining and Metals (ICMM), 2007; http://www.euras.be/assets/files/MERAG/MERAG.pdf.
2. HERAG: Health risk assessment guidance for metals; 978-0-9553591-4-9;International Council of Mining and Metals (ICMM), 2007; http://www.ebrc.de/ebrc/downloads/HERAG.pdf.
3. Framework for metals risk assessment; EPA 120/R-07/001;U.S. Environmental Protection Agency, Office of the Science Advisor, Risk Assessment Forum, 2007; http://www.epa.gov/raf/metalsframework/pdfs/metals-risk-assessment-final.pdf.