Sakamoto, Taro, author
The International Society for Educational Information Press, Inc., 1975
Buku Teks
Sakamoto, Taro
The International Society for Educational Information, 1984.
Buku Teks
Aston, W.G., author
Charles E. Tutle, 1981
Buku Teks
Halliday, Jon, author
Pantheon Books, 1975
Buku Teks
Frellesvig, Bjark, author
Cambridge University Press, 2010
Buku Teks