Hall, James
John murray, 1995
Buku Referensi
Hall, James
John Murray, 1995
Buku Referensi
Moe, Dean
Augsburg Publishing House, 1985
Buku Referensi
Chishti, Amatullah Armstrong
Paramount Publishing Enterprise, 2005
Buku Teks
National Academy of the Korean Language, 2002
Buku Referensi