Leiserson, Avery, 1913-, author
Alfred A. Knopf, 1958
Buku Teks
Polsby, Nelson W., author
Charles Scribner`s Sons, 1964
Buku Teks
Neustadt, Richard E., author
John Wiley & Sons, 1961
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Artikel Jurnal
Divine, Robert A., author
New Viewpoints, 1974
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