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Harvard Business Review, Michael D. Watkins, Clayton Christensen, Kenneth L. Kraemer (2015). “Harvard Business Review Leadership Library: The Executive Collection (12 Books)”, Harvard Business Review Press
Richard Cobden (1864). “Mr. Cobden and "The Times": Correspondence Between Mr. Cobden, M.P., and Mr. Delane, Editor of "The Times" ; with a Supplementary Correspondence Between Mr. Cobden, and the Editor of the "Daily Telegraph".”, p.10