Jo, Gyong-suk, author
San SUng Chul Pan sa, 2002
Buku Teks
Reinsma, Riemer, author
Atlas, 2009
Buku Referensi
Brodrick, Alan Houghton
Oxford University Press, 1942
Buku Teks
Senior, Michael, author
Longman, 1979
Buku Teks
King, Stephen, author
A signet book , 1991
Buku Teks