Zulkifli Amsyah, author
Gramedia Pustaka Utama, 1997
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McLeod, Raymond, author
Indeks, 2001
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McLeod, Raymond, author
Prenhallindo, 1995
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Siagian, Sondang P., author
Bumi Aksara, 2005
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Edhy Sutanta, author
Graha Ilmu, 2003
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