Columbia subject headings:
Leisure in literature--Congresses.
Leisure--Management--Congresses.
Leisure--Social aspects--Congresses.
Harvard subject headings:
Leisure in literature--Congresses.
Leisure--Management--Congresses.
Leisure--Social aspects--Congresses.
Princeton subject headings:
Leisure in literature--Congresses.
Leisure--Management--Congresses.
Leisure--Social aspects--Congresses.