Artikel Jurnal
Davis, Angela Y. (Angela Yvonne), 1944 -. author
Haymarket Books, 2016
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Polsby, Nelson W.
Charles Scribner's Sons, 1980
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Kitzinger, Uwe W.
Clarendon Press, 1960
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Morgenthau, Hans J.
Alfred A. Knopf, 1950
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