Republic of Korea, 2007
Buku Teks
Dielman, Terry E., author
Thomson Brooks/Cole, 2005
Buku Teks
New York : Saturday Review of Literature Company
Majalah, Jurnal, Buletin
Jan, Gen Yong
Megatrend, 2007
Buku Teks
Ko, Jong-sok, author
Gaemagawon, 2009
Buku Referensi