20 Segi hanguk soseol 7
Choe Won-sik ... [et al.]
Changbi, 2007
 Buku Teks
20 Segi hanguk soseol 4
Choe Won-sik ... [and others]
Changbi, 2009
 Buku Teks
20 Segi hanguk soseol 5
Choe Won-sik, Kim Yoo Jung, Chae Man Shik
Changbi, 2009
 Buku Teks
20 Segi hanguk soseol 12 : Nam saeng yi, bil sageuro, jandeung, jimaeh
Kim Su Ryang, Heo Jun, Hyun Duk, Choi Jung Hae
Changbi, 2009
 Buku Teks
Choe, Won-sik, author
20 Segi hanguk soseul 6
Changbi, 2009
 Buku Teks
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