Son, In-sik
The DAily Han Times, 2006
Buku Teks
edited by Sang Yee Cheon
Koryo Taehakkyo Ch'ulp'anbu, 2013
Buku Teks
Benedict, Ruth
A Mentor Book, 1958
Buku Teks
Benedict, Ruth
Penguin Books , 1947
Buku Teks
Lee, Sang-oak
[Publisher not identified], [Date of publication not identified]
Buku Teks