Verdross, Alfred
Verlag fur Geschichte und Politik Wien, 1977
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Barents, J. (Jan), author
Erlangga, 1978
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Fowler, Robert Booth, author
Praeger, 1985
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Ellsworth, John W
McGraw-Hill, 1976
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Machiavelli, Niccolo, author
Kapustakaan Populer Gramedia, 1996
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