Lee, Hee-jong, author
Guko wangei sokdam amgi bop
Gona Chulphansa, 2010
 Buku Teks
Sara innun hangugo. Sokdam
Korea Language PLUS, 2007
 Buku Teks
Guko saenghwal
by Lee Sam Hyong ... [and others]
Joongang kyoyook jin heung yeongooso, 2003
 Buku Teks
Lee, Ki-mun, author
Donga sae guko sajon
Seoul Doosan Dong a, 2003
 Buku Referensi
Nam, Gi-sim, author
Hyeondae Guko thongsaron
Thaehaksa, 2010
 Buku Teks
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