"A brief informal history of the Computer Laboratory". University of Cambridge. 20 December 2001. Archived from the original on 13 November 2010. http://www.cl.cam.ac.uk/conference/EDSAC99/history.html
Roger Needham (1979). "Systems aspects of the Cambridge Ring". Proceedings of the seventh symposium on Operating systems principles - SOSP '79. pp. 82–85. doi:10.1145/800215.806573. ISBN 0-89791-009-5. 0-89791-009-5
John R. Pierce, Network for Block Switching of Data, Bell System Technical Journal, Vol. 51, No. 6 (July–August, 1972); pages 1133-1145. /wiki/John_R._Pierce
W. J. Kropfl, An Experimental Data Block Switching System, Bell System Technical Journal, Vol. 51, No. 6 (July–August, 1972); pages 1147-1165. https://archive.org/details/bstj51-6-1147/mode/1up
C. H. Coker, An Experimental Interconnection of Computers Through a Loop, Bell System Technical Journal, Vol. 51, No. 6 (July–August, 1972); pages 1167-1175. https://archive.org/details/bstj51-6-1167/mode/1up
Andrew Hopper; Roger Needham (1988). "The Cambridge Fast Ring Networking System" (PDF). Orl-88-1. 37 (10): 1214–1223. doi:10.1109/12.5983. /wiki/Roger_Needham
Andy Hopper (2016). Prof. Andy Hopper - The Cambridge Ring and the Computer Lab. Cambridge, UK: Centre for Computing History – via YouTube. /wiki/Andy_Hopper
"The Ring" (PDF). Cambridge Computer Lab Ring. 2005. pp. 12–13. https://www.cl.cam.ac.uk/downloads/ring/ring-2005-01.pdf
"Cambridge Computer Lab Ring". Cambridge Computer Laboratory. 2024. https://www.cst.cam.ac.uk/ring