National Academy of the Korean Language, 2002
Buku Referensi
Choi, Won-Oh, author
Global Oriental, 2008
Buku Teks
Martin, Samuel E.
Rutland Charles E. Tuttle Company 1992
Buku Referensi
edited and translated by Tai-jin Kim
Asiatic Research Center, Korea University, 1976
Buku Referensi
Lee, Kwang Kyu, author
Jimoondang, 2003
Buku Teks