The Japan Institute for Labour Policy and Training, 2009
Buku Teks
The Japan Institute for Labour Policy and Training, 2006
Buku Teks
The INternational Society for Educational Information,, 1992.
Buku Teks
Sides, Dorothy Smith
Dover, 1961
Buku Teks
Denison, Edward F
The Brookings Institution, 1976
Buku Teks