Panggabean, Henry P., author
Pustaka Sinar Harapan, 2001
Buku Teks
Kaligis, O.C. (Otto Cornelis), 1942-, author
O.C. Kaligis & Associates, 2006
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Universitas Indonesia, 2007
UI - Skripsi (Membership)
Tim Panitia Seminar Eksaminasi
Centre for Strategic and International Studies, 2008
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Panggabean, Henry P., author
Pustaka Sinar Harapan, 2002
Buku Teks