Shannon, William V.
The heir apparent : Robert Kennedy and the struggle for power / by William V. Shannon
Macmillan, 1967
 Buku Teks
Remnick, David, author
The bridge : the life and rise of Barack Obama
Vintage Books, 2011
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Tillich, Paul
The courage to be / Paul Tillich
Nisbet, 1952
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Kunstler, William M.
The Case for courage / by William M. Kunstler
William-Morrow and company, 1962
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Kennedy, John F.
Pribadi-pribadi jang berani: (profiles in courage) / John F. Kennedy
Endang, 1956
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