Farley, Miriam S., author
The John Day, 1950
Buku Teks
Ministry of Labor, 1953
Buku Teks
The Japan Institute for Labour Policy and Training, 2006
Majalah, Jurnal, Buletin
The Japan Institute for Labour Policy and Training, 2018
Majalah, Jurnal, Buletin
Gould, William B., IV, author
MIT Press, 1982
Buku Teks