Toynbee, Arnold J., author
Oxford University Press, 1957
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Humas Pemkab Kutai Barat, 2008
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Carpenter, Allan, author
Facts On File, 1990
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editors Charles Phillips, Alan Axelrod
Simon & Schuster Macmillan, 1996
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Cohen, Edi, author
Rockport Publishers, 2000
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