“Unix creator Dennis Ritchie dies aged 70”. BBC News (October 13, 2011). 2011年10月14日閲覧。 “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.”
Keill, Liz. "Berkeley Heights man wins Japan Prize for inventing UNIX operating system", Independent Press, February 1, 2011. Accessed October 17, 2011. "Ritchie, 69, has lived in Berkeley Heights for 15 years. He was born in Bronxville, New York, grew up in Summit and attended Summit High School before going to Harvard University."