Artikel Jurnal
Tokyo : The Japan Institute of International Affairs
Majalah, Jurnal, Buletin
Journal of Population, 13 (1) 2007 : 91-120, 2007
Artikel Jurnal
The Japan Institute for Labour Policy and Training, 2009
Buku Teks
Taira, Koji
Columbia University Press, 1970
Buku Teks