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American Management Association, 2013
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Frans Sayogie, author
Fakultas Hukum Universitas Indonesia, 2012
UI - Tesis (Open)
Selby, David, author
Cambridge University Press, 1988
Buku Teks
Vloten, H. Van
Universitaire Pers Leiden, 1949
Buku Teks
Unesco, 1970
Buku Teks