Lee, Sang
20 Segi hanguk soseol 9
Chang BI, 2005
 Buku Teks
20 Segi hanguk soseol 5
Choe Won-sik, Kim Yoo Jung, Chae Man Shik
Changbi, 2009
 Buku Teks
20 Segi hanguk soseol 7
Choe Won-sik ... [et al.]
Changbi, 2007
 Buku Teks
20 Segi hanguk soseol 47
[by] Gong Sun-ok ... [and others]
Chang bi, 2006
 Buku Teks
Kim, Yeong-heon
20 Segi hanguk soseol 45
Chang bi, 2006
 Buku Teks