Columbia subject headings:
Harvard subject headings:
Hospitality industry--Management--Congresses.
Recreation--Sociological aspects--Congresses.
Tourism--Social aspects--Congresses.
Tourists--Psychology--Congresses.
Tourists--Social conditions--Congresses.
Princeton subject headings:
Hospitality industry--Management--Congresses.
Recreation--Sociological aspects--Congresses.
Tourism--Social aspects--Congresses.
Tourists--Psychology--Congresses.
Tourists--Social conditions--Congresses.