Tokyo : University Research Institute Corporation, 2007,
Majalah, Jurnal, Buletin
Japan P.E.N. Club, {s.a}
Majalah, Jurnal, Buletin
Tokyo, the Jepan Institute of Labour
Majalah, Jurnal, Buletin
Buku Referensi
Engel, Heinrich
Tokyo, Charles E. Tuttle, 1983
Buku Teks