Hall, John W., author
Yale University Press, 1974
Buku Teks
edited by Kozo Yamamura
Cambridge University Press, 1995
Buku Referensi
Wakita Haruko, author
University of Tokyo Press, 2006
Buku Teks
Inoue, Yasushi, author
Kodansha International, 1982
Buku Teks
Heneveld, Word
The World Bank , 1996
Buku Teks