Selben sarang ui ko ko yajanamu
translated by Yun Seung
Sanha, 2004
 Buku Teks
Ko, Jong-sok, author
Guko ui phunggyeongdel : Ko Jong-sok ui urimal gangchaw = language of landscapes: Chong-sŏk Ko's Korean classes
Munhak gawajiseongsa, 2007
 Buku Referensi
Ko, Chong-sok, 1959-, author
Maltul ui punggyong : Ko Chong-sok ui Hangugo sanchaek
Kaema Kowon, 2007
 Buku Teks
U ko ko
Approaches and endeavours for health, vol.2/ U Ko Ko
SEARO, 1991
 Buku Teks
Saroso Wirodihardjo, author
Ko-operasi dan masalah batik
GKBI, 1954
 Buku Teks
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