John von Neumann's remarks as keynote speaker at the first national meeting of the Association for Computing Machinery (1947) as quoted in "Archaeology of computers: Reminiscences, 1945-1947" by Franz L. Alt, Communications of the ACM, Volume 15, Issue 7, special issue: Twenty-fifth anniversary of the Association for Computing Machinery (p. 694), July 1972.

Francis Bacon, Basil Montagu (1821). “A critique of Bacon's "Novum Organum," by Basil Montagu, extracted from the Retrospective Review, 1821. Few MS. notes”, p.285

Isaac Barrow (1734). “The Usefulness of Mathematical Learning Explained and Demonstrated: Being Mathematical Lectures Read in the Publick Schools at the University of Cambridge”, p.28

Francis Bacon, Basil Montagu (1821). “A critique of Bacon's "Novum Organum," by Basil Montagu, extracted from the Retrospective Review, 1821. Few MS. notes”, p.285