Gomes, James
Think Centre, [date of publication not identified]
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Gomez, James, author
Think Centre, 2002
Buku Teks
Shelly, Gary B., author
Course Technology Cengage Learning, 2012
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Nelson, Stephen L., author
Elex Media Komputindo , 1996
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Olinsky, Sheryl, author
Prentice-Hall, 1998
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