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Buku Teks
Rourke, John T.
McGraw-Hill, 2001
Buku Teks
Rourke, John T.
McGraw-Hill, 2010
Buku Teks
Kegley, Charles William, Jr.
St. Martin`s Press, 1997
Buku Teks
Andrew Hurrell, Ngaire Woods, Satria Utama S., Diana Arimbi
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Buku Teks