Hong Jong-son, Pak Young-son, Sok Geum-ho, Umeda Hiroyuki
Pagijong Press, 2008
Buku Teks
Michael Soon Lee with Sensei Grant Tabuchi
American Management Association, 2007
eBooks
Seoul Selection, 2010
Buku Teks
Hahn, Gap-Soo
Korean Oberseas Information Service, 1981
Buku Teks
Hanguk Chodeung Gugeo Gyoyuk Yeonguso
Jeonginchulphansa, 2008
Buku Teks