New York : The American Council on the Teaching of Foreign Language Inc
Majalah, Jurnal, Buletin
Tacitus, Cornelius
Penguin Books, 1956
Buku Teks SO
Kim, Pusik
Academy of Korean Studies Press, 2012
Buku Teks
Johnston, Grahame
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Buku Teks SO
School of Oriental Studies, 1938
Buku Teks SO