Columbia subject headings:
Harvard subject headings:
Leisure--Congresses
Leisure--Economic aspects--Congresses.
Work--Congresses
Work--Psychological aspects--Congresses
Work-life balance--Congresses.
Working class--Recreation--Congresses.
Princeton subject headings:
Leisure--Congresses.
Leisure--Economic aspects--Congresses.
Work--Congresses.
Work--Psychological aspects--Congresses.
Work-life balance--Congresses.
Working class--Recreation--Congresses.