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MCGraw-Hill , 2002
Multimedia
HInkle, Deborah
Glencoe/McGraw-Hill , 2002
Buku Teks SO
MicroPro International Corporation , 1988
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Foreman, Patricia L.
Good Earth Publications , 1992
Buku Teks SO
Van Duyn, Julia
John Wiley & Sons, 1982
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