1. Cultures with requisite imagination;Westrum,1993
2. John J Nance Blind Trust (1986). Safety Margins in 1980s.
3. Columbia Accident Investigation Board Report (2003). NASA. Chap. 7. A broken Safety Culture. Chap. 8.4 organisation, culture, and unintended consequences.
4. Managing the risks of organizational accidents;Reason,1997
5. Perin, C. (1992). British Rail – the case of the unrocked boat.