(en) Hector Zenil, A Computable Universe: Understanding and Exploring Nature as Computation, World Scientific, (ISBN978-981-4374-29-3, lire en ligne), p. 165
(en) Ronald M. Baecker, Readings in Groupware and Computer-supported Cooperative Work: Assisting Human-human Collaboration, Morgan Kaufmann, (ISBN978-1-55860-241-0, lire en ligne), p. 5
businessweek.com
(en) « Lotus' Irene Greif: "We Need to Do More for Technical Women" », Business Week, (lire en ligne, consulté le )