Columbia subject headings:
Harvard subject headings:
Adult education--Europe.
Adult education--Japan.
Adult education--United States.
Continuing education--Europe.
Continuing education--Japan.
Continuing education--United States.
Princeton subject headings:
Employees--Training of--European Union countries.
Employees--Training of--Japan.
Employees--Training of--United States.
Occupational training--European Union countries.
Occupational training--Japan.
Occupational training--United States.