John Dewey, «What Is Thought?», in How We Think (Lexington, Mass.: Heath, 1910), стр. 13.
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Barbara Lovett Cline, Men Who Made a New Physics (Chicago: University of Chicago Press, 1965), стр. 34. См. также J. L. Heilbron, The Dilemmas of an Upright Man (Cambridge, Mass.: Harvard University Press, 1996), стр. 10.