Pak, Song-sil, author
Tanguk Taehakkyo Chulpanbu , 2005
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Buku Teks
Ministry of Finance and Economy, 1997
Buku Teks
Young-Mee, Choo...[et.al.]
University of Hawai'i Press, 2000
Buku Teks
Crane, Paul S., author
Seoul Press, 1999
Buku Teks