1. The railway revolution: George and Robert Stevenson, St. Martin's Press, New York, NY, 1960, p. 147.
2. Empire Express: Building the first trans-continental railroad, Viking, New York, NY, 1999.
3. Loss prevention in the process industries, 2nd Edition, Butterworth-Heinemann, Oxford, UK, 1996, Appendices 2, 4, and 5.
4. Process plants: A handbook for inherently safer design, Taylor & Francis, Bristol, PA, 1998.