Stuart, Gene S.
Washington D.C. National Geographic Society 1988,
Buku Teks
New York: W.W.Norton & Company, 1988,
Buku Referensi
Cho, Hae-il
Dong-su-Munhak-sa, 1990
Buku Teks SO
edited by John Miksic
Archipelago Press, [date of publication not identified]
Buku Teks SO
Maine, Henry Sumner, 1822-1888
Everyman's Library, 1972
Buku Teks