1. Khawaji Ibrahim. Developing system-based leading indicators for proactive risk management in the chemical processing industry. SM thesis. MIT, 2012.
2. Risk management in a dynamic society: a modeling problem;Rasmussen;Saf Sci,1997
3. A new accident model for engineering safer systems;Leveson;Saf Sci,2004
4. Engineering a safer world: applying systems thinking to safety;Leveson,2012
5. American Bureau of Shipping, Safety culture and leading indicators of safety; January 2012, Houston TX.