by The Association of Foreign Language Propagation
Moon-Ye Suhlim, 1973
Buku Teks SO
TalktomelnKorean
HangulPARK, 2012
Buku Teks
Starr, Wilmarth H.
American Book Company, 1959
Buku Teks SO
EPB Publ., 1980
Buku Teks SO
Gilbert, Mark
Hodder & Stoughton, 1999
Buku Teks SO