editor Ruth D. Whitehouse
Facts On File Publications, 1983
Buku Referensi
Kaushik, R.K., author
SS. Mubaruk and Bross, 1995
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Korean Educational Development Institute
Korean Educational Development Institute, 1998
Buku Teks
Mellor, DH
Routledge, 1995
Buku Teks
Foreign languages Press, 2010
Buku Teks