Carnegie, Dale
Pionir Jaya, [date of publication not identified]
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Daniella Amyana, author
2017
UI - Skripsi (Membership)
Muri A. Yusuf, author
Ghalia Indonesia, 2005
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Putu Putrayasa
Gramedia, 2004
Buku Teks
Tambunan, Emil H., author
Indonesia Publishing House, 2007
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