Lafley, A. G., and Martin, R. L., Playing to Win: How Strategy Really Works (Boston: Harvard Business Review Press, 2013), ch. 3.
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Knee, J. A., Greenwald, B. C., and Seave, A., The Curse of the Mogul (New York: Profile, 2009; Kindle edn), ch. 2, section 2.3: ‘Real Competitive Advantages/Cost’.
