Evans, M. Stanton
Clear and present dangers a conservative view of america`s government
harcourt Brace Jovanovich,Inc., 1975
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Klass, David
Danger Zone
Scholastic Inc., 1996
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Dalby, Andrew
Language in danger
A. Lane, 2002
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Summers, Vivian
Clear English
Penguin Books, 1991
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Pressman, Roger S.
Software shock: the danger and the opportunity
Dorset House, 1991
Buku Teks SO