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Chang Jak iwa BT pyong Sa, 1999
Buku Teks
Bang, Hyon-sok
Changbi, 2003
Buku Teks
Seo, Dong-chan
Seoul Dong Yangmungo, 2000
Buku Teks
Carnegie Council on Ethics and International Affairs , 1992
Buku Teks
The Presidential Secretariat , 1992
Buku Teks