Choi, Song Wu
Gugo-ui gosu.1-3
Communication Books, 2007
 Buku Referensi
No, Dae Gyu
Gugo hak seaseol
Sinwonmunhwasa, 2008
 Buku Teks
Kim, Tae Gon
Gugo ohwi ui thongsijok yongu
Bogjong, 2008
 Buku Teks
Gugo Nophimbep phyohyon ui paldal 2
by Hong Jong Son ... [and others]
Doseo Chulphcn;Doseo Chulphcn, 2009
 Buku Teks
Gugo ui sije, sang, sopop : munbob ui thamgu 1
by Hong Jong Son ...[and others]
Bakmunsa, 2009
 Buku Teks