Adams, Edward B.
Seoul International Pub. House, 1972
Buku Teks
Pak, Song-sil, author
Tanguk Taehakkyo Chulpanbu , 2005
Buku Referensi
Cassirer, Ernst, author
Beacon, 1955
Buku Teks
Sherman, Dan, author
Arbor House, 1980
Buku Teks
Gay, Peter, author
Weidenfeld and Nicholson, 1966-1969
Buku Teks