Sampson, A. (1975). Seven Sisters: The great oil companies and the world they shaped. Bantam Book.
Cita Chicago (17th ed.)Sampson, Anthony. Seven Sisters: The Great Oil Companies and the World They Shaped. USA: Bantam Book, 1975.
Cita MLA (9th ed.)Sampson, Anthony. Seven Sisters: The Great Oil Companies and the World They Shaped. Bantam Book, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.