Columbia subject headings:
Call centers--Mexico.
Precarious employment--Mexico.
Subcontracting--Mexico.
Harvard subject headings:
Call centers--Mexico.
Contracting out--Mexico.
Precarious employment--Mexico.
Subcontracting--Mexico.
Princeton subject headings:
Call centers--Mexico.
Contracting out--Mexico.
Precarious employment--Mexico.
Subcontracting--Mexico.