by Sang-Oak Lee [and others]
[publisher not identified], [date of publication not identified]
Buku Teks
The Language Research Institute of Seoul National University ; written by Lee Sang-oak ... [et al]
Hollym, 1998
Buku Teks
Artikel Jurnal
Korea Foundation, 2015
Multimedia
Lee, Sang-oak
Sotong, 2008
Buku Teks