Sampson, A. (1975). The seven sisters: The great oil companies and the world they shaped. The Viking Press.
Chicago-viite (17. p.)Sampson, Anthony. The Seven Sisters: The Great Oil Companies and the World They Shaped. New York: The Viking Press, 1975.
MLA-viite (9. p.)Sampson, Anthony. The Seven Sisters: The Great Oil Companies and the World They Shaped. The Viking Press, 1975.
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