1. U.S. Chemical Safety and Hazard Investigation Board Investigation http://www.csb.gov/investigations/detail.aspx?SID=8&Type=2&pg=1&F_InvestigationId=8? 2010
2. CSB http://www.csb.gov/videoroom/detail.aspx?VID=32 2010
3. CSB http://www.csb.gov/recommendations/details.aspx?SID=8 2010
4. A history of process safety and loss prevention in the American Institute of Chemical Engineers;Hendershot;PSP,2009
5. A century of process safety-And more;Crowl;PSP,2009