Choi, Song-wu
Gugo-ui gosu.1-3
Communication Books, 2007
 Buku Referensi
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
Kugohak ui ihae : saerop gethyonaen gugo hak ibmunda
by Choe Chon Sung ... [and others]
Paju-si : Taehaksa, 2008
 Buku Teks
Gugo munjang ui hwaktae wa Jos silhyon 3
[by] Hong Jong-son ... [and others]
Do seo Chulphan, 2009
 Buku Teks