Nilsen, Robert, author
Avalon Travel, 2003
Buku Referensi
Yun, Hyon-gyong, author
Samsung Chulpansa, 2012
Buku Teks
International Cultural Society of Korea, 1983
Buku Teks
APA Publications, 2011
Buku Teks
International Cultural Society of Korea , 1988
Buku Teks