Sampson, A. (1975). The seven sisters: The great oil companies and the world they made. Hodder and Stoughton.
Cita Chicago (17th ed.)Sampson, Anthony. The Seven Sisters: The Great Oil Companies and the World They Made. London: Hodder and Stoughton, 1975.
Cita MLA (9th ed.)Sampson, Anthony. The Seven Sisters: The Great Oil Companies and the World They Made. Hodder and Stoughton, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.