Columbia subject headings:
International business enterprises--Developing countries.
International business enterprises--Taxation.
Oil and gas leases.
Petroleum industry and trade--Developing countries.
Petroleum industry and trade--Finance.
Petroleum--Taxation.
Harvard subject headings:
International business enterprises--Taxation
Oil and gas leases.
Petroleum industry and trade--Finance
Petroleum--Taxation
Princeton subject headings:
International business enterprises--Taxation.
Oil and gas leases.
Petroleum industry and trade--Finance.
Petroleum--Taxation.