Simpson, Alan
Mastering word perfect 6.1 for windows
Tech Publications, 1995
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Christoper
Belajar secara praktis Word Perfect 5.1
Dinastindo, 1992
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Larsen, Jen
Future perfect
HarperTeen, an imprint of HarperCollinsPublishers, 2015
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Mangan, James T.
The secret of perfect living
Prentice-Hall, 1963
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Aste, Tomaso
The fursuit of perfect packing
Taylor and Francis, 2008
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