George, B. a., & Gergen, D. (2015). Discover your true north (Expanded and updated edition. Second edition, revised and Updated.). Wiey.
Cita Chicago Style (17a ed.)George, Bill author, y David Gergen. Discover Your True North. Expanded and updated edition. Second edition, revised and Updated. Hoboken, New Jersey: Wiey, 2015.
Cita MLA (9a ed.)George, Bill author, y David Gergen. Discover Your True North. Expanded and updated edition. Second edition, revised and Updated. Wiey, 2015.
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