Columbia University Press, 1959
Buku Teks
University of Tokyo , 1968
Buku Teks
Fukuzawa, Yukichi, 1835-1901
Columbia University Press, 1960
Buku Teks
Heneveld, Word
The World Bank , 1996
Buku Teks
Boissohneau, Alice
Toronto Simon and Pierre 1983
Buku Teks