Okita, Saburo
University of Tokyo Press, 1980
Buku Teks
Thirlwall, Anthony Philip, author
English Language Book Society, 1978
Buku Teks
Yong-Shik, Lee, author
Kluwer, 2008
Buku Teks
Rothstein, Robert L., author
Columbia University Press, 1977
Buku Teks
Okita, Saburo
The Japan Foundation , 1975
Buku Teks