1. International Electrotechnical Commission, IEC 61511, Functional safety: safety instrumented systems for the process sector, Geneva, Switzerland, 2003.
2. Instrumentation, Systems, and Automation Society, ISA TR84.00.04, Guidelines on the implementation of ANSI/ISA 84.00.01–2004 (ISA 61511 modified), Research Triangle Park, NC, 2006.
3. Reliability maintainability and risk, 5th edition, Butterworth-Heinemann Ltd., Oxford, 1997.
4. Lee's loss pr;Mannan,2005
5. Instrumentation, Systems, and Automation Society, ISA TR84.00.02, Safety Instrumented Functions (SIF)—Safety Integrity Level (SIL) evaluation techniques, Research Triangle Park, NC, 2002.