Columbia subject headings:
Independent contractors--Great Britain.
Independent contractors--United States.
Labor contract--Great Britain.
Labor contract--United States.
Master and servant--Great Britain.
Master and servant--United States.
Harvard subject headings:
Independent contractors--Great Britain.
Independent contractors--United States.
Labor contract--Great Britain.
Labor contract--United States.
Master and servant--Great Britain.
Master and servant--United States.
Princeton subject headings:
Independent contractors--Great Britain.
Independent contractors--United States.
Labor contract--Great Britain.
Labor contract--United States.
Master and servant--Great Britain.
Master and servant--United States.