Rourke, John T.
McGraw-Hill, 2010
Buku Teks SO
Kegley, Charles William, Jr.
St. Martin`s Press, 1997
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Andrew Hurrell, Ngaire Woods, Satria Utama S., Diana Arimbi
Fakultas Ekonomi UI, 2001
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Kalijarvi, Thorsten V.
Thomas Y. Crowell, 1954
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Rourke, John T.
McGraw-Hill, 2001
Buku Teks SO