Fallows, James M., author
Houghton Mifflin, 1989
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Sorauf, Frank J.
Little, Brown & Co., 1988
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Riza Annisa Putri, author
2018
UI - Makalah dan Kertas Kerja
Albright, Madeleine, author
Harper Perenial, 2008
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Wright, Charles Alan, author
West Publishing, 1970
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