Susumo, Ohno, author
Kokusai Bunka Shinkoka, 1970
Buku Teks
Spirkin, A.G., author
[publisher not identified], [date of publication not identified]
Buku Teks
Diamond, A. S. (Arthur Sigismund)
Methuen , 1959
Buku Teks
Takada, Noriko, author
Macmillan, 1995
Buku Teks
Frellesvig, Bjark, author
Cambridge University Press, 2010
Buku Teks