Ruttenberg, Harold J
Harper ,
Buku Teks
New York: W.W.Norton & Company, 1988,
Buku Referensi
Cho, Hae-il, author
Dong-su-Munhak-sa, 1990
Buku Teks
Tocqueville, Alexis De, author
Oxford University Press, 1961
Buku Teks
Tocqueville, Alexis De, author
The New American Library, 1963
Buku Teks