Hollym, 2007
Buku Teks
edited by Steven Moorhead and Gordon Grice
Rockport Publisher, 1997
Buku Referensi
BooQs publisher data, 2010
Buku Referensi
Yim, Seock Jae, author
Ewha Womans University Press, 2005
Buku Teks
Yim, Seock Jae, author
Ewha Womans University Press, 2005
Buku Teks