Kim, Tae Gon, author
Gugo ohwi ui thongsijok yongu
Bogjong, 2008
 Buku Teks
Kim, Hyong Chol, 1950-, author
Guko ohwi yongu
Daehakyo Chulphanbu, 2009
 Buku Referensi
Choi, Song Wu, author
Gugo-ui gosu.1-3
Communication Books, 2007
 Buku Referensi
Gugo Nophimbep phyohyon ui paldal 2
by Hong Jong Son ... [and others]
Doseo Chulphcn;Doseo Chulphcn, 2009
 Buku Teks
Han, Gil, author
Hyondae uri mal-ui toep uripop yongu
Youkrack, 2009
 Buku Teks
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