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Buku Teks
Rourke, John T., author
McGraw-Hill, 2010
Buku Teks
Andrew Hurrell, Ngaire Woods, Satria Utama S., Diana Arimbi
Fakultas Ekonomi UI, 2001
Buku Teks
Reynolds, Charles, author
Martin Robertson, 1973
Buku Teks
Padelford, Norman J., author
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Buku Teks