Columbia subject headings:
Foreign workers certification--United States.
Foreign workers--Legal status, laws, etc.--United States.
Information technology--Employees--Supply and demand--United States.
Visas--United States.
Harvard subject headings:
Foreign worker certification--United States
Foreign workers certification--United States.
Foreign workers--Legal status, laws, etc.--United States
Information technology--Employees--Supply and demand--United States.
Professional employees--Supply and demand--United States.
Visas--United States.
Princeton subject headings:
Foreign workers certification--United States.
Foreign workers--Legal status, laws, etc.--United States.
Information technology--Employees--Supply and demand--United States.
Visas--United States.