Michael, Watkins, author
Doseochulpansoso, 2004
Buku Teks
Foreign Languages Publishing House, 1959
Buku Teks
Soyama, Takehiko
Tokyo: Toto Shuppan, 1964
Buku Teks
Astley, Thea, author
Penguin Books, 1989
Buku Teks
Harcourt, Brace & World, Inc., 1941
Buku Teks