Safety Critical Systems Handbookhttp://www.fishpond.com.au/Books/Nonfiction/Technology/Engineering/Chemical_Biochemical/search_used.php?id=9780080967813
A Straightfoward Guide to Functional Safety, IEC 61508 (2010 Edition) and Related Standards, Including Process IEC 61511 and Machinery IEC 62061 and ISO 13849: 2010