↑ Lohr, Steve (October 12, 2011), "Dennis Ritchie, Programming Trailblazer, Dies at 70", The New York Times, สืบค้นเมื่อ October 13, 2011, Dennis M. Ritchie, who helped shape the modern digital era by creating software tools that power things as diverse as search engines like Google and smartphones, was found dead on Wednesday at his home in Berkeley Heights, N.J. He was 70. Mr. Ritchie, who lived alone, was in frail health in recent years after treatment for prostate cancer and heart disease, said his brother Bill.
↑ "Unix creator Dennis Ritchie dies aged 70". BBC News. October 13, 2011. สืบค้นเมื่อ 2011-10-14. Pioneering computer scientist Dennis Ritchie has died after a long illness. ... The first news of Dr Ritchie's death came via Rob Pike, a former colleague who worked with him at Bell Labs. Mr Ritchie's passing was then confirmed in a statement from Alcatel Lucent which now owns Bell Labs.
↑ Rob Pike (October 12, 2011), (untitled post to Google+), สืบค้นเมื่อ October 14, 2011, I just heard that, after a long illness, Dennis Ritchie (dmr) died at home this weekend. I have no more information.
↑ Campbell-Kelly, Martin (October 13, 2011), "Dennis Ritchie obituary", The Guardian, สืบค้นเมื่อ October 13, 2011, Dennis MacAlistair Ritchie, computer scientist, born 9 September 1941; died 12 October 2011CS1 maint: date and year (link)
