Columbia subject headings:
HIV (Viruses)--Costa Rica.
Prostitution--Costa Rica.
Sex tourism--Costa Rica.
Harvard subject headings:
HIV (Viruses)--Costa Rica.
HIV (Viruses)--United States.
Prostitution--Costa Rica.
Prostitution--United States
Sex tourism--Costa Rica.
Sex tourism--United States.
Princeton subject headings:
HIV (Viruses)--Costa Rica.
Prostitution--Costa Rica.
Sex tourism--Costa Rica.