Columbia subject headings:
Harvard subject headings:
Employment (Economic theory)--Congresses
Free choice of employment--Congresses.
Hybridization--Economic aspects--Congresses.
Manpower policy--Congresses
Self-employed--Congresses.
Social policy--Congresses
Princeton subject headings:
Employment (Economic theory)--Congresses.
Free choice of employment--Congresses.
Hybridization--Economic aspects--Congresses.
Manpower policy--Congresses.
Self-employed--Congresses.
Social policy--Congresses.