Sitkoff, Harvard, author
Oxford University Press, 2000
Buku Teks
Oxford University Press, 1995
Buku Teks
New York: W.W.Norton & Company, 1988,
Buku Referensi
Cho, Hae-il, author
Dong-su-Munhak-sa, 1990
Buku Teks
International Society for Educational Information, Inc., 1973
Buku Teks