Jon, Am-hyon, author
Munhak Suchob, 2005
Buku Teks
Hadley, Mac E.
Prentice-Hall, 2007
Buku Teks
Kim, Wan-sok, author
Yeongnmkhadineol, 2007
Buku Teks
Lee, Suong Ho, author
Purengil, 2009
Buku Teks
Sungkonghoe East Asian Institute
Hyunsil, 2009
Buku Teks