Enis, Ben M.
Mass Allyn & Bacon , 1969
Buku Teks
Prentice-Hall, [date of publication not identified]
Buku Teks
Appleton-Century-Crofts, 1967
Buku Teks
Cox, William E. Jr.
N.Y. John Wiley c., 1979
Buku Teks
Haeoe Hongbowon, author
Korean Culture and Information Service, 2011
Buku Teks