Stephen Mansfield
Michigan : Baker Book House, 2017
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Rehnquist, William H., author
Alfred A. Knopf, 2004
Buku Teks
White, Theodore H., author
Atheneum Publishers, 1964
Buku Teks
Neustadt, Richard E., author
John Wiley & Sons, 1961
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Edwards, George C., author
Thomson, 2006
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