United Nations Educational, Scientific and Cultural Organization (UNESCO)
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Buku Teks SO
APSSAM, 1998
Buku Teks
Institute of Social Science, University of Tokyo,
Majalah, Jurnal, Buletin
Korean Social Science Research Council, 2003
Majalah, Jurnal, Buletin
Bonner, Thomas Neville
Prentice-Hall, 1960
Buku Teks