Columbia subject headings:
Government business enterprises--Mexico--Case studies.
Government business enterprises--Venezuela--Case studies.
Petroleum industry and trade--Government ownership--Mexico--History.
Petroleum industry and trade--Government ownership--Venezuela--History.
Petróleos Mexicanos--History.
Petróleos de Venezuela, S.A.--History.
Harvard subject headings:
Government business enterprises--Mexico--Case studies.
Government business enterprises--Venezuela--Case studies.
Petroleum industry and trade--Government ownership--Mexico--History.
Petroleum industry and trade--Government ownership--Venezuela--History.
Petróleos Mexicanos--History.
Petróleos de Venezuela, S.A.--History.
Princeton subject headings:
Case studies.
Government business enterprises--Mexico--Case studies.
Government business enterprises--Venezuela--Case studies.
Petroleum industry and trade--Government ownership--Mexico--History.
Petroleum industry and trade--Government ownership--Venezuela--History.
Petróleos Mexicanos--History.
Petróleos de Venezuela, S.A.--History.