National Institutes of Diabetes and Digestive and Kidney Diseases, .
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Конфиденциальное интервью с вице-президентом компании Lifetime Fitness, июнь 2015 года.
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Robert Kegan, Immunity to Change: How to Overcome It and Unlock the Potential in Yourself and Your Organization (Boston: Harvard Business Press, 2009), p. 1.
