by Joseph S. Nye ... [and others]
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Buku Teks
Dallin, David J., author
Hollis & Carter, 1951
Buku Teks
Griffith, William E., author
MIT Press, 1965
Buku Teks
Yong, H.E. Ong Keng, author
2006
Artikel Jurnal
Campbell, Robert W., author
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Buku Teks