National Academy of the Korean Language, 2002
Buku Referensi
Byon, Andrew Sangpil, author
Routledge, Taylor & Francis Group, 2009
Buku Teks
Young-Key, author
Routledge, 2009
Buku Teks
Park, Jong-ho, author
Changbi , 2011
Buku Teks
Miho, Choo, author
University of Hawai'i Press, 1996
Buku Referensi