1. 1) Collegium Ramazzini (1993) Third Collegium Ramazzini Statement. Chrysotile as a Carcinogen. http://collegiumramazzini.org/download/3_ThirdCRStatement(1993).pdf.
2. 2) Collegium Ramazzini (1999) Sixth Collegium Ramazzini Statement. Call for an International Ban on Asbestos. http://collegiumramazzini.org/download/6_SixthCRStatement(1999).pdf.
3. 3) Collegium Ramazzini (2004) Eleventh Collegium Ramazzini Statement. Call for an International Ban on Asbestos: Statement Update. http://collegiumramazzini.org/download/11_EleventhCRStatement(2004).pdf.
4. 4) Collegium Ramazzini (2010) Fifteen Collegium Ramazzini Statement. Asbestos is Still with Us: Repeat Call for a Universal Ban. http://collegiumramazzini.org/download/15_FifteenthCRStatement(2010).pdf.
5. 5) United States Geological Survey (2013) Minerals Yearbook: Asbestos [Advance Release]. http://minerals.usgs.gov/minerals/pubs/commodity/asbestos/myb1-2013-asbes.pdf.