Columbia subject headings:
Harvard subject headings:
Casinos--Economic aspects--Handbooks, manuals, etc.
Casinos--Research--Handbooks, manuals, etc.
Gambling--Economic aspects--Handbooks, manuals, etc.
Gambling--Research--Handbooks, manuals, etc.
Marketing research--Handbooks, manuals, etc.
Princeton subject headings:
Casinos--Research--United States--Handbooks, manuals, etc.
Gambling--Research--United States--Handbooks, manuals, etc.