edited by John H. Koo and Andrew C. Nahm
Hollym, 2013
Buku Teks
New Jersey Hollym International Corp 2005
Buku Teks
Lee, Kwang Kyu
Jimoondang, 2003
Buku Teks
edited by Sohn Ho-min
University of Hawaii, 2006
Buku Teks
Choi, Jun-sik
Heronemedia, 2009
Buku Referensi